diff --git a/frontend/src/components/Flow/BrainNode.tsx b/frontend/src/components/Flow/BrainNode.tsx
index 2f980d3..f9d5d5d 100644
--- a/frontend/src/components/Flow/BrainNode.tsx
+++ b/frontend/src/components/Flow/BrainNode.tsx
@@ -22,14 +22,22 @@ export type BrainNodeData = {
 
 /**
  * The mark's own proportions, measured off `fluksio-light.svg`: a 1.4545 ring
- * and a 0.4848 gap on a 6.303 outer diameter, leaving the disc the 38.5% in
- * the middle.
+ * and a 0.4848 gap on a 6.303 outer diameter, which puts the ring at 0.231 and
+ * leaves the disc the 38.5% in the middle.
+ *
+ * The ring here is drawn a little thinner than the wordmark's, on purpose. The
+ * mark is read at wordmark size, where 0.231 is one confident stroke; a graph
+ * of 32px neurons under connections heavier than the mark ever draws reads that
+ * same stroke as a blob, and thinning it gives the disc room to be a dot.
  *
  * Shares rather than fixed widths because the neurons run from 32px to 96px:
  * the same ring in pixels would swallow the smallest and read as a hairline on
  * the largest, and it is the proportion that makes a circle look like the mark.
+ * Rounded where they are applied, though, because the browser snaps a
+ * fractional border to the device pixels one edge at a time: 7.392px lands as 7
+ * on one side and 8 on the other, and the disc sits off centre.
  */
-const RING = 0.231
+const RING = 0.18
 const GAP = 0.077
 
 function BrainNodeComponent({ data }: NodeProps) {
@@ -69,8 +77,8 @@ function BrainNodeComponent({ data }: NodeProps) {
       style={{
         width: size,
         height: size,
-        borderWidth: size * RING,
-        boxShadow: `inset 0 0 0 ${size * GAP}px var(--brain-gap)`,
+        borderWidth: Math.round(size * RING),
+        boxShadow: `inset 0 0 0 ${Math.round(size * GAP)}px var(--brain-gap)`,
       }}
       title={`${label} · ${kind} · ${members.join(", ")}${issue ? ` · ${issue}` : ""}`}
     >
diff --git a/frontend/src/components/Flow/flow.css b/frontend/src/components/Flow/flow.css
index 283ff44..00c5e53 100644
--- a/frontend/src/components/Flow/flow.css
+++ b/frontend/src/components/Flow/flow.css
@@ -20,6 +20,11 @@
   );
   --xy-edge-stroke-selected: var(--primary);
   --xy-edge-stroke-width: 1.5;
+  /*
+   * What a pulse widens to on its way in; the width above is where it settles
+   * back. Per canvas, because the brain draws its connections heavier.
+   */
+  --edge-pulse-width: 2.5;
   --xy-handle-background-color: var(--card);
   --xy-handle-border-color: var(--muted-foreground);
   --xy-selection-background-color: color-mix(
@@ -59,7 +64,7 @@
   @keyframes edge-pulse {
     from {
       stroke: var(--primary);
-      stroke-width: 2.5;
+      stroke-width: var(--edge-pulse-width);
     }
     to {
       stroke: var(--edge-rest);
@@ -137,8 +142,13 @@
 .react-flow.brain-flat {
   --xy-background-color: transparent;
   --brain-decay: 90s;
-  /* Thicker than the editor's, to match the weight the mark draws them at. */
-  --xy-edge-stroke-width: 2;
+  /*
+   * Thicker than the editor's, to match the weight the mark draws them at — and
+   * the pulse widens with it, or a message would leave its edge looking thinner
+   * than it rests.
+   */
+  --xy-edge-stroke-width: 3;
+  --edge-pulse-width: 4;
   --xy-background-pattern-dots-color: color-mix(
     in srgb,
     var(--muted-foreground) 22%,
@@ -296,7 +306,7 @@
 .brain-dot {
   fill: var(--card);
   stroke: var(--brain-ink);
-  stroke-width: 1.5;
+  stroke-width: 2;
 }
 
 .brain-dot.brain-dot-out {