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diff --git a/public/js/world.js b/public/js/world.js
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+++ b/public/js/world.js
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+/* global AFRAME */
+// The world that's loaded (campfire, temple, …) is the entity marked
+// `data-world="<component>"` in its template. Its component provides `seats`
+// ([{ x, y, z, yaw }]) and may provide:
+//   spawn                 { x, z, yaw } where people arrive
+//   screen                { x, y, z, yaw, width } where a shared screen first
+//                         appears (screens.js): the middle of its picture. At
+//                         yaw 0 it faces +z, toward someone who arrived with
+//                         spawn yaw 0
+//   confine(headPos)      moves a head position back inside the walkable area
+//   floorAt(x, z)         floor height there
+//   tools                 [{ name, label, object, grip, tip, butt, ink }]: things to
+//                         pick up and draw with (wield.js). Each lies along its
+//                         object's +x; grip, tip and butt are local Vector3s and
+//                         ink is a '#rrggbb' color
+//   touchables            [{ name, label(), distance(worldPos), use() }]: things
+//                         to reach for in VR; the trigger calls use() (wield.js)
+// Worlds that leave these out get the campfire's defaults in locomotion.js.
+window.CurrentWorld = function (sceneEl) {
+  const el = (sceneEl || AFRAME.scenes[0]).querySelector('[data-world]');
+  return (el && el.components[el.dataset.world]) || null;
+};