diff --git a/frontend/src/arthur/domain/outline.cljs b/frontend/src/arthur/domain/outline.cljs
index 0aa6790..ea8037b 100644
--- a/frontend/src/arthur/domain/outline.cljs
+++ b/frontend/src/arthur/domain/outline.cljs
@@ -36,7 +36,9 @@
   "The brush, `size` pixels across, from `[ax ay]` to `[bx by]`: a disc every
   half radius along the way, so a fast stroke is still one stroke."
   [m [ax ay] [bx by] size]
-  (let [r     (max 0.5 (/ size 2))
+  (let [[ox oy] (or (:origin m) [0 0])
+        ax (- ax ox) ay (- ay oy) bx (- bx ox) by (- by oy)
+        r     (max 0.5 (/ size 2))
         steps (max 1 (js/Math.ceil (/ (js/Math.hypot (- bx ax) (- by ay)) (max 0.5 (/ r 2)))))]
     (dotimes [i (inc steps)]
       (let [t (/ i steps)]
@@ -115,11 +117,11 @@
       [(max 0 (dec (aget b 0))) (max 0 (dec (aget b 1)))
        (min (dec w) (inc (aget b 2))) (min (dec h) (inc (aget b 3)))])))
 
-(defn pieces
+(defn- buffer-pieces
   "Each piece of the mask bigger than `smallest` pixels, biggest first, as
   `{:outer ring :holes [ring …]}` at full resolution: a hole is a gap inside a
   piece that does not reach the outside, of more than `smallest` pixels."
-  ([m] (pieces m 2))
+  ([m] (buffer-pieces m 2))
   ([{:keys [w h ^js buf] :as m} smallest]
    (when-let [[x0 y0 x1 y1 :as box] (bounds m)]
      (let [lab   (js/Int32Array. (* w h))
@@ -148,6 +150,14 @@
                     {:outer (ring w (in id) start)
                      :holes (mapv #(ring w (in (:id %)) (:start %)) (get holes id))})))))))
 
+(defn pieces
+  ([m] (pieces m 2))
+  ([m smallest]
+   (let [[ox oy] (or (:origin m) [0 0])
+         shift (fn [ring] (mapv (fn [i v] (+ v (if (even? i) ox oy))) (range) ring))]
+     (mapv (fn [p] (-> p (update :outer shift) (update :holes #(mapv shift %))))
+           (buffer-pieces m smallest)))))
+
 (defn rings
   "The outside of every piece of the mask, as flat corner points, biggest
   first."
diff --git a/frontend/src/arthur/ui/layout.cljs b/frontend/src/arthur/ui/layout.cljs
index 2947f03..836dbbe 100644
--- a/frontend/src/arthur/ui/layout.cljs
+++ b/frontend/src/arthur/ui/layout.cljs
@@ -43,7 +43,7 @@
   "[lo hi] per key — pixels for a pane, a multiplier for a zoom. The low end of
   `:time` is the transport strip plus a row, so dragging the timeline shut and
   shutting it are the same shape of window."
-  {:pool [120 480] :params [150 560] :time [44 660] :stage [1 8] :tl [1 24]})
+  {:pool [120 480] :params [150 560] :time [44 660] :stage [0.1 16] :tl [1 24]})
 
 (defn- clamp [k v]
   (let [[lo hi] (limits k)] (max lo (min hi v))))
@@ -136,12 +136,9 @@
            label])))]))
 
 (defn- stepped [k z out?]
-  ;; The stage steps by WHOLE pixels. A fractional scale under
-  ;; `image-rendering: pixelated` draws some rows of the raster thicker than
-  ;; others, which misrepresents the one thing the preview exists to judge. The
-  ;; timeline has no pixel grid to honour, so it steps geometrically.
+  ;; Geometric steps work below 100% as well as above it.
   (if (= :stage k)
-    (+ z (if out? -1 1))
+    (* z (if out? (/ 1 1.25) 1.25))
     (* z (if out? (/ 1 1.5) 1.5))))
 
 (defn zoomer
@@ -165,3 +162,32 @@
      [:button {:disabled (>= z hi) :aria-label (str label " zoom in")
                :title (str "zoom " label " in")
                :on-click #(rf/dispatch [::set k (stepped k z false)])} "+"]]))
+
+
+(rf/reg-sub ::mat (fn [db _] (merge {:margin 100 :opacity 0.55} (get-in db [:ui :passepartout]))))
+(rf/reg-event-db ::mat (fn [db [_ k v]] (assoc-in db [:ui :passepartout k] v)))
+
+(defn fit-stage! []
+  (when-let [area (.querySelector js/document ".stage-area")]
+    (when-let [wrap (.querySelector area ".stage-wrap")]
+      (let [w (js/parseFloat (.getAttribute wrap "data-width"))
+            h (js/parseFloat (.getAttribute wrap "data-height"))]
+        (rf/dispatch-sync [::set :stage (min (/ (- (.-clientWidth area) 32) w)
+                                           (/ (- (.-clientHeight area) 32) h))])
+        (js/requestAnimationFrame #(do (set! (.-scrollLeft area) 0) (set! (.-scrollTop area) 0)))))))
+
+(defn stage-controls []
+  (let [{:keys [margin opacity]} @(rf/subscribe [::mat])]
+    [:<>
+     [:button {:on-click fit-stage! :title "Fit stage and surrounding workspace in view"} "fit"]
+     [:details.passepartout-controls
+      [:summary "passepartout"]
+      [:div.view-popout
+       [:label "Outside margin (px)"
+        [:input {:type "number" :min 0 :max 1000 :value margin
+                 :on-change #(let [v (js/parseInt (.. % -target -value))]
+                               (when (js/Number.isFinite v) (rf/dispatch [::mat :margin (max 0 (min 1000 v))])))}]]
+       [:label "Shade outside export bounds"
+        [:input {:type "range" :min 0 :max 1 :step 0.05 :value opacity
+                 :on-change #(rf/dispatch [::mat :opacity (js/parseFloat (.. % -target -value))])}]]
+       [:p "Draw outside the rectangle. Exports trim to the symbol’s dimensions."]]]]))
diff --git a/frontend/src/arthur/ui/palette.cljs b/frontend/src/arthur/ui/palette.cljs
index 528b161..a95b038 100644
--- a/frontend/src/arthur/ui/palette.cljs
+++ b/frontend/src/arthur/ui/palette.cljs
@@ -1,6 +1,6 @@
 (ns arthur.ui.palette
   "The palette: a grid of the open palette's slots under the tools, and the
-  palette asset it is, in the options bar.
+  palette asset it is, beside that grid.
 
   A GRID BESIDE THE TOOLS, as Deluxe Paint and Animator Pro put theirs — the
   indexed tools this one descends from — rather than a strip of dots across the
@@ -176,10 +176,19 @@
 
 (defn assets
   "Which palette asset the grid shows, and a new or duplicated one, for the
-  options bar."
+  tool strip, with a popout for the full asset controls."
   []
   (let [[clip pid palette] (shown)]
-    [:div.palette-assets
+    [:details.palette-assets
+     {:on-toggle (fn [e]
+                   (let [el (.-currentTarget e)
+                         box (.getBoundingClientRect el)
+                         pop (.querySelector el ".palette-popout")]
+                     (set! (.. pop -style -left) (str (+ 4 (.-right box)) "px"))
+                     (set! (.. pop -style -top) (str (max 8 (min (.-top box) (- (.-innerHeight js/window) 160))) "px"))))}
+     [:summary {:title (:name palette)} [:span (:name palette)]]
+     [:div.palette-popout
+     [:strong (:name palette)]
      [:select {:value (str pid)
                :title "palette asset"
                :on-change (fn [e]
@@ -191,4 +200,4 @@
         ^{:key (str id)} [:option {:value (str id)} (:name p)])]
      [:button {:title "new 16-slot palette" :on-click #(rf/dispatch [::project/new-palette])} "+"]
      [:button {:title (str "duplicate " (:name palette) " — a copy you can retone")
-               :on-click #(rf/dispatch [::project/duplicate-palette pid])} "⧉"]]))
+               :on-click #(rf/dispatch [::project/duplicate-palette pid])} "clone"]]]))
diff --git a/frontend/src/arthur/ui/player.cljs b/frontend/src/arthur/ui/player.cljs
index 649c3f5..7abbfd3 100644
--- a/frontend/src/arthur/ui/player.cljs
+++ b/frontend/src/arthur/ui/player.cljs
@@ -32,6 +32,7 @@
             [arthur.subs.ui :as ui-sub]
             [arthur.ui.canvas :as canvas]
             [arthur.ui.tracing :as tracing]
+            [arthur.ui.layout :as layout]
             [re-frame.core :as rf]
             [reagent.ratom :as ratom]))
 
@@ -128,6 +129,7 @@
                       :frames   @(rf/subscribe [::render/frames])
                       :width    @(rf/subscribe [::sub/width])
                       :height   @(rf/subscribe [::sub/height])
+                      :mat      @(rf/subscribe [::layout/mat])
                       :tracing  t
                       :frame    @(rf/subscribe [::sub/frame])
                       :playing? @(rf/subscribe [::sub/playing?])
@@ -144,7 +146,7 @@
              ;; Comparing the whole map is as cheap as picking fields out of it:
              ;; the document and the store it carries are the same OBJECTS unless
              ;; the resolver changed too, and that is tested first.
-             (when-not (and (identical? was now) (= was-t t) (= pen (:pen before)))
+             (when-not (and (identical? was now) (= was-t t) (= pen (:pen before)) (= (:mat before) (:mat @snapshot)))
                (repaint!))))))
 
 ;; The brush or eraser stroke being painted: its mask, mutated in place as the
@@ -259,13 +261,21 @@
       (as-> ops (reduce #(clip/in-layer %1 target (poly (outline/join %2) {:color 0 :knock knock}))
                         ops rings)))))
 
+(defn- shifted-op [op margin]
+  (cond-> op
+    (:pts op) (assoc :pts (let [pts (:pts op) n (* 2 (:n op)) shifted (js/Float64Array. n)]
+                           (dotimes [i n] (aset shifted i (+ margin (aget pts i))))
+                           shifted))
+    (:cx op) (update :cx + margin)
+    (:cy op) (update :cy + margin)))
+
 (defn paint!
   "Resolve `f` and put it on the canvas. `ops` are consumed here and only here —
   the resolver reuses its point buffers between frames, so they have to be
   rasterised before the next frame is asked for."
   [f]
   (let [{:keys [canvas]} @state
-        {:keys [resolver palette ramp width height tracing playing?]} @snapshot]
+        {:keys [resolver palette ramp width height tracing playing? mat]} @snapshot]
     (when (and canvas resolver width height)
       ;; User Timing, so a profile in the DevTools performance panel has named
       ;; spans in the Timings track instead of a wall of anonymous frames. Three
@@ -274,7 +284,8 @@
       ;; THE STAGE IS THE CLIP'S, not a constant. Project dimensions are
       ;; independent of the footage, so the size the frame is rasterised at comes
       ;; out of the document like everything else.
-      (let [ras (raster-for width height)
+      (let [margin (:margin mat 100)
+            ras (raster-for (+ width (* 2 margin)) (+ height (* 2 margin)))
             {traces true picture false} (group-by #(= :trace (:kind %)) (resolver f))
             ;; A layer switched off, or all of them, is not on the stage at all:
             ;; not painted and not there to be clicked.
@@ -285,10 +296,10 @@
         (swap! state assoc :ops (into (vec picture) traces))
         (-> ras
             (raster/clear! bg)
-            (raster/draw-ops! (with-previews picture palette active)))
+            (raster/draw-ops! (map #(shifted-op % margin) (with-previews picture palette active))))
         (js/performance.mark "arthur/blit:start")
         (canvas/blit! canvas ras (pal/effective-ramp palette active))
-        (tracing/paint! traces (assoc tracing :width width :playing? playing?) repaint!))
+        (tracing/paint! traces (assoc tracing :width (+ width (* 2 margin)) :origin margin :playing? playing?) repaint!))
       (js/performance.measure "arthur/resolve+draw" "arthur/paint:start" "arthur/blit:start")
       (js/performance.measure "arthur/paint" "arthur/paint:start")
       ;; User Timing entries otherwise accumulate forever in the browser's
diff --git a/frontend/src/arthur/ui/stage.cljs b/frontend/src/arthur/ui/stage.cljs
index 804591a..05bf35e 100644
--- a/frontend/src/arthur/ui/stage.cljs
+++ b/frontend/src/arthur/ui/stage.cljs
@@ -32,20 +32,17 @@
             [re-frame.core :as rf]
             [reagent.core :as r]))
 
-;; THE ZOOM IS NOT A CONSTANT ANY MORE — it is `ui/layout`'s, an integer in
-;; [1 8], 2 to begin with. It scales the canvas with CSS and never its backing
-;; store, so the browser suite still reads 320x200 of real pixels off
-;; `canvas.stage` whatever the view is zoomed to; see `ui/canvas`.
+;; Pointer coordinates come from the SVG transform, including the outside margin.
 
-(defn stage-point
-  "Where a pointer event landed, in stage pixels. Shared by the vertex editor and
-  by a drop out of the media pool, which is the whole reason it is public."
-  [event w h]
-  (let [box (.getBoundingClientRect (.-currentTarget event))]
-    [(-> (/ (* (- (.-clientX event) (.-left box)) w) (.-width box))
-         js/Math.round (max 0) (min (dec w)))
-     (-> (/ (* (- (.-clientY event) (.-top box)) h) (.-height box))
-         js/Math.round (max 0) (min (dec h)))]))
+(defn- event-point [element event]
+  (let [svg (if (= "svg" (.-tagName element)) element (.querySelector element "svg.paint-overlay"))
+        pt (.createSVGPoint svg)]
+    (set! (.-x pt) (.-clientX event))
+    (set! (.-y pt) (.-clientY event))
+    (let [p (.matrixTransform pt (.inverse (.getScreenCTM svg)))] [(.-x p) (.-y p)])))
+
+(defn stage-point [event _w _h]
+  (mapv js/Math.round (event-point (.-currentTarget event) event)))
 
 (defn- pairs [pts] (mapv vec (partition 2 pts)))
 
@@ -115,9 +112,7 @@
   "Where a pointer event is, in stage pixels, unrounded and unclamped: a drag
   holding the pointer may leave the stage and still be moving something."
   [^js svg event w h]
-  (let [box (.getBoundingClientRect svg)]
-    [(/ (* (- (.-clientX event) (.-left box)) w) (.-width box))
-     (/ (* (- (.-clientY event) (.-top box)) h) (.-height box))]))
+  (event-point svg event))
 
 ;; The move, turn or scale being dragged, as `dragging` is for a vertex: the
 ;; placement and transform it started from, and where. What it makes of the
@@ -420,7 +415,8 @@
                                     (when (and (some? c) (not (symbol/knockout? c)) (or all? (= c start)))
                                       q))))
                           (get-in document [:symbols sid :nodes]))))
-        m       (outline/stamp! (outline/mask (:w ctx) (:h ctx)) p p size)
+        m       (outline/stamp! (let [margin (:margin @(rf/subscribe [::layout/mat]))]
+                                                (assoc (outline/mask (+ (:w ctx) (* 2 margin)) (+ (:h ctx) (* 2 margin))) :origin [(- margin) (- margin)])) p p size)
         s       (cond
                   ;; The brush's target is the creation target, which the player
                   ;; reads for itself.
@@ -503,7 +499,7 @@
        [:circle {:class (str "first" (when (and hover (closes? draft hover)) " closing"))
                  :cx fx :cy fy :r 1.8}]])))
 
-(defn- overlay [w h zoom]
+(defn- overlay [w h zoom margin opacity]
   (let [tool  @(rf/subscribe [::sub/tool])
         draft @(rf/subscribe [::sub/draft])
         hover @(rf/subscribe [::sub/hover])
@@ -532,8 +528,8 @@
         mark @marquee]
     [:svg {:class (str "paint-overlay tool-" (name tool)
                        (when (and pen? hover (closes? draft hover)) " closing"))
-           :width (* zoom w) :height (* zoom h)
-           :view-box (str "0 0 " w " " h)
+           :width (* zoom (+ w (* 2 margin))) :height (* zoom (+ h (* 2 margin)))
+           :view-box (str (- margin) " " (- margin) " " (+ w (* 2 margin)) " " (+ h (* 2 margin)))
            :tab-index -1
            :on-pointer-down
            (fn [^js event]
@@ -619,6 +615,9 @@
                                 (reset! dragging nil) (reset! marquee nil)
                                 (reset! painting nil) (player/stroke! nil)
                                 (let-go! false))}
+     [:path {:d (str "M" (- margin) " " (- margin) "h" (+ w (* 2 margin)) "v" (+ h (* 2 margin)) "h" (- (+ w (* 2 margin))) "z M0 0v" h "h" w "v" (- h) "z")
+             :fill "#000" :fill-rule "evenodd" :opacity opacity :pointer-events "none"}]
+     [:rect {:x 0 :y 0 :width w :height h :fill "none" :stroke "#aaa" :vector-effect "non-scaling-stroke" :pointer-events "none"}]
      [ghost]
      (when (seq selected-pts)
        [:polygon.selected-paint-outline
@@ -638,6 +637,50 @@
      (when pen? [draft-lines draft hover])
      (when paints? [cursor tool])]))
 
+(defonce space-held? (atom false))
+(defonce pan (atom nil))
+(defonce navigation-keys
+  (when (exists? js/window)
+    (.addEventListener js/window "keydown"
+      (fn [e] (when (and (= "Space" (.-code e))
+                         (not (#{"INPUT" "TEXTAREA" "SELECT"} (.-tagName (.-target e)))) )
+                (.preventDefault e) (reset! space-held? true))))
+    (.addEventListener js/window "keyup" #(when (= "Space" (.-code %)) (reset! space-held? false)))
+    (.addEventListener js/window "blur" #(do (reset! space-held? false) (reset! pan nil)))))
+
+(defn- navigation []
+  {:title "Wheel to zoom · Space-drag or middle-drag to pan"
+   :ref (fn [el]
+          (when el
+            (set! (.-onwheel el)
+              (fn [e]
+                (.preventDefault e)
+                (let [z @(rf/subscribe [::layout/zoom :stage])
+                      wrap (.querySelector el ".stage-wrap")
+                      wb (.getBoundingClientRect wrap)
+                      x (- (.-clientX e) (.-left wb)) y (- (.-clientY e) (.-top wb))
+                      next (max 0.1 (min 16 (* z (js/Math.exp (* -0.002 (.-deltaY e))))))]
+                  (rf/dispatch-sync [::layout/set :stage next])
+                  (js/requestAnimationFrame
+                    (fn []
+                      (let [nb (.getBoundingClientRect wrap)]
+                        (set! (.-scrollLeft el) (+ (.-scrollLeft el) (- (+ (.-left nb) (* x (/ next z))) (.-clientX e))))
+                        (set! (.-scrollTop el) (+ (.-scrollTop el) (- (+ (.-top nb) (* y (/ next z))) (.-clientY e)))))))))))
+          nil)
+   :on-pointer-down-capture
+   (fn [e] (when (or (= 1 (.-button e)) (and (= 0 (.-button e)) @space-held?))
+             (.preventDefault e) (.stopPropagation e)
+             (let [el (.-currentTarget e)]
+               (reset! pan [(.-clientX e) (.-clientY e) (.-scrollLeft el) (.-scrollTop el)])
+               (.setPointerCapture el (.-pointerId e)))))
+   :on-pointer-move-capture
+   (fn [e] (when-let [[x y sx sy] @pan]
+             (.stopPropagation e)
+             (set! (.-scrollLeft (.-currentTarget e)) (+ sx (- x (.-clientX e))))
+             (set! (.-scrollTop (.-currentTarget e)) (+ sy (- y (.-clientY e))))))
+   :on-pointer-up-capture (fn [e] (when @pan (.stopPropagation e) (reset! pan nil)))
+   :on-pointer-cancel-capture (fn [_] (reset! pan nil))})
+
 (defn view []
   ;; Reactive on the clip's dimensions, so selecting a clip of another size
   ;; resizes the canvas. `ui/canvas` guards the width assignment — which
@@ -651,15 +694,19 @@
         destination @(rf/subscribe [::sub/creation-target])
         destination-name (when-let [sid (:sid destination)]
                            (clip/symbol-name clip sid))
-        zoom @(rf/subscribe [::layout/zoom :stage])]
+        zoom @(rf/subscribe [::layout/zoom :stage])
+        {:keys [margin opacity]} @(rf/subscribe [::layout/mat])
+        vw (+ w (* 2 margin)) vh (+ h (* 2 margin))]
     [:div.stage-area
+     (navigation)
      [:div.stage-wrap
       ;; A drop on the stage lands at the PLAYHEAD, where the pointer is in space;
       ;; a drop on the timeline lands where the pointer is in time.
       ;; `dragenter` is cancelled as well as `dragover`: a drop target has to
       ;; accept on BOTH, and the element under the pointer changes whenever the
       ;; preview re-renders beneath it, which fires a fresh `dragenter`.
-      {:on-drag-enter (fn [^js event] (when (drag/accepts?) (.preventDefault event)))
+      {:data-width vw :data-height vh
+       :on-drag-enter (fn [^js event] (when (drag/accepts?) (.preventDefault event)))
        :on-drag-over (fn [^js event]
                        (when (drag/accepts?)
                          (.preventDefault event)
@@ -671,12 +718,12 @@
                   (.preventDefault event)
                   (drag/land! frame (stage-point event w h)))}
       [:canvas.stage {:ref #(player/set-canvas! %)
-                      :width w :height h
-                      :style {:width (str (* zoom w) "px")
-                              :height (str (* zoom h) "px")}}]
+                      :width vw :height vh
+                      :style {:width (str (* zoom vw) "px")
+                              :height (str (* zoom vh) "px")}}]
       [:canvas.tracing {:ref #(tracing/set-canvas! %)
-                        :width (* zoom w) :height (* zoom h)}]
-      [overlay w h zoom]]
+                        :width (* zoom vw) :height (* zoom vh)}]
+      [overlay w h zoom margin opacity]]
      (when destination-name
        [:div.stage-target "creating in " [:strong destination-name]])
      [tools/adjust-last]]))
diff --git a/frontend/src/arthur/ui/tools.cljs b/frontend/src/arthur/ui/tools.cljs
index f681767..44b8c89 100644
--- a/frontend/src/arthur/ui/tools.cljs
+++ b/frontend/src/arthur/ui/tools.cljs
@@ -43,6 +43,7 @@
                    :title (str name " (" (.toUpperCase key) ") — " tip)
                    :on-click #(rf/dispatch [::ui/set-tool t])}
           [:svg {:view-box "0 0 18 18" :width 18 :height 18} icon]]))]
+     [palette/assets]
      [palette/grid]]))
 
 (defn- size-control []
@@ -85,7 +86,6 @@
          [:span.dim (str (count selections) " selected")]
          [:span.dim.hint tip]))
      [:span.spacer]
-     [palette/assets]
      (let [{:keys [on? opacity]} @(rf/subscribe [::render/tracing])]
        [:<>
         [:button {:class (when on? "on")
@@ -97,7 +97,8 @@
           :on-change #(rf/dispatch [::ui/tracing-opacity (js/parseFloat (.. % -target -value))])}]])
      ;; The stage's zoom: a property of the view and not of the document, so it
      ;; sits in the view's own chrome rather than in the inspector.
-     [layout/zoomer :stage "the stage"]]))
+     [layout/zoomer :stage "the stage"]
+     [layout/stage-controls]]))
 
 (defn adjust-last
   "Blender's Adjust Last Operation, for a brush or eraser stroke: its fit,
diff --git a/frontend/src/arthur/ui/tracing.cljs b/frontend/src/arthur/ui/tracing.cljs
index 710fd7a..64076c3 100644
--- a/frontend/src/arthur/ui/tracing.cljs
+++ b/frontend/src/arthur/ui/tracing.cljs
@@ -124,7 +124,7 @@
   "Draw trace ops `ops`, in draw order, at `opacity`, over a stage `width` wide.
   `on-ready` is called when a still or a manifest that was missing arrives, to
   paint again."
-  [ops {:keys [opacity width playing?]} on-ready]
+  [ops {:keys [opacity width playing? origin]} on-ready]
   (when-let [^js canvas (:canvas @state)]
     (let [ctx  (.getContext canvas "2d")
           zoom (/ (.-width canvas) width)
@@ -148,7 +148,7 @@
             (.setTransform ctx
                            (* zoom (aget m 0)) (* zoom (aget m 1))
                            (* zoom (aget m 2)) (* zoom (aget m 3))
-                           (* zoom (aget m 4)) (* zoom (aget m 5)))
+                           (* zoom (+ (or origin 0) (aget m 4))) (* zoom (+ (or origin 0) (aget m 5))))
             (.drawImage ctx img 0 0 w h))
           (when (and playing? (not= frame (get-in was [node :frame])))
             (warm! op on-ready)))))))
diff --git a/frontend/test/arthur/domain/outline_test.cljs b/frontend/test/arthur/domain/outline_test.cljs
index 2ad2a0a..d72cad1 100644
--- a/frontend/test/arthur/domain/outline_test.cljs
+++ b/frontend/test/arthur/domain/outline_test.cljs
@@ -96,3 +96,12 @@
       (is (zero? (aget back (+ 25 (* 20 60)))) "and is a hole")
       (is (every? #(< (count %) 30) rs) "and simple")
       (is (zero? (aget back (+ 5 (* 5 60)))) "and nothing outside the body is filled"))))
+
+(deftest a-brush-mask-can-live-outside-the-export-rectangle
+  (let [m (assoc (outline/mask 60 50) :origin [-20 -20])
+        normal (outline/stamp! (outline/mask 60 50) [10 12] [30 24] 6)
+        outside (outline/stamp! m [-10 -8] [10 4] 6)
+        shift (fn [ring] (mapv #(- % 20) ring))]
+    (is (= (vec (array-seq (:buf normal))) (vec (array-seq (:buf outside)))))
+    (is (= (mapv shift (outline/rings normal)) (outline/rings outside)))
+    (is (neg? (apply min (first (outline/rings outside)))))))
diff --git a/static/arthur/app.css b/static/arthur/app.css
index c633610..e0d91b5 100644
--- a/static/arthur/app.css
+++ b/static/arthur/app.css
@@ -1713,3 +1713,16 @@ button.share-button:hover, button.share-button.on { filter: brightness(1.1); }
   border: 1px solid rgba(255, 255, 255, .8);
   border-radius: 2px;
 }
+
+/* Palette assets stay in the existing narrow tool strip. */
+.toolbox .palette-assets { display: block; width: 44px; flex: 0 0 auto; }
+.palette-assets summary { cursor: pointer; font-size: 10px; line-height: 1.25; overflow-wrap: anywhere; padding: 3px; }
+.palette-popout, .view-popout { position: fixed; z-index: 100; background: var(--pane); color: var(--fg); border: 1px solid var(--line); padding: 10px; box-shadow: 0 4px 16px #0008; line-height: 1.4; }
+.palette-popout { left: 52px; width: 230px; display: flex; flex-wrap: wrap; gap: 7px; }
+.palette-popout strong { width: 100%; overflow-wrap: anywhere; }
+.palette-popout select { width: 100%; }
+.view-popout { right: 16px; width: 240px; }
+.view-popout label { display: block; margin-bottom: 8px; }
+.view-popout input { width: 100%; }
+.passepartout-controls summary { cursor: pointer; }
+.stage-wrap { flex: 0 0 auto; }