diff --git a/packages/web/src/fpv/fx3d.ts b/packages/web/src/fpv/fx3d.ts
index c536226..4786b77 100644
--- a/packages/web/src/fpv/fx3d.ts
+++ b/packages/web/src/fpv/fx3d.ts
@@ -114,9 +114,21 @@ export function fpFxForEvents(
     if ((e.type === "moved" || e.type === "creatureMoved") && "direction" in e) {
       const via = e.type === "moved" ? e.via : "step";
       const key = edgeKey(e.from, e.direction);
-      if (via === "step" && view.board.edges[key] === "door") {
+      const edgeState = view.board.edges[key] ?? "open";
+      if (via === "step" && edgeState === "door") {
         out.push({ fx: { id: nextId++, kind: "door", edge: key, t0: 0, dur: 1100 }, delay: 0 });
       }
+      if (via === "step" && edgeState === "wall") {
+        // A body just stepped through what THIS viewer holds solid — an
+        // illusion the mover disbelieves. The viewer keeps their false
+        // belief, but the crossing must read as magic, not a glitch:
+        // shimmer both faces, and wash the screen if these are the eyes.
+        out.push({ fx: { id: nextId++, kind: "impact", art: "shimmer", at: { x: e.from.x + 0.5, y: e.from.y + 0.5 }, t0: 0, dur: 500 }, delay: 0 });
+        out.push({ fx: { id: nextId++, kind: "impact", art: "shimmer", at: { x: e.to.x + 0.5, y: e.to.y + 0.5 }, t0: 0, dur: 500 }, delay: 200 });
+        if (e.type === "moved" && e.player === povId) {
+          out.push({ fx: { id: nextId++, kind: "flash", color: "#9a8fb0", peak: 0.35, t0: 0, dur: 450 }, delay: 0 });
+        }
+      }
       if (e.type === "moved" && e.via === "passWall") {
         out.push({ fx: { id: nextId++, kind: "impact", art: "shimmer", at: { x: e.from.x + 0.5, y: e.from.y + 0.5 }, t0: 0, dur: 500 }, delay: 0 });
         out.push({ fx: { id: nextId++, kind: "impact", art: "shimmer", at: { x: e.to.x + 0.5, y: e.to.y + 0.5 }, t0: 0, dur: 500 }, delay: 200 });