The hollow mask illusion: why a concave face still looks convex

A 5-beat faceless video outline for “The hollow mask illusion: why a concave face still looks convex” in the Optical illusions explained niche, derived from caption timing of 2 reference videos.

Angles

• Cold-open on the concrete hook from the primary reference — The Royal Institution leads with a scene, not a definition dump
• Make the mechanism explicit with one visual beat: Why do you think he's moving as you move? Because it's an illusion. This is the 'hollow ma…
• Contrast or scale-up using the second reference (TPMvids): For that we need some newspaper, and some wallpaper paste to make papier mache, and we're …
• Close on what the viewer can check themselves; original narration only — do not copy reference wording

Beat-by-beat structure

1. Hook (0:00–0:30): open on the puzzle of 'The hollow mask illusion' in one image.
2. Setup (0:30–2:00): define the key terms in plain words; borrow structure from The Royal Institution, not lines.
3. Mechanism (2:00–5:00): walk the cause-and-effect with one diagram; cite the evidence beat (Why do you think he's moving as you move? Because it's an illusion. Th…).
4. Contrast (5:00–7:00): show the common myth or the second case from TPMvids.
5. Recap card: three takeaways + one 'check this yourself' action. Original narration only.

Reference videos

• Top 10 Disney Secrets, Illusions & Tricks Explained - Walt Disney World & Disneyland s61R31LNI5s
• How To Make a Hollow Mask Illusion - At home science - ExpeRimental #22 0gCcWBnChVA

Method

yt-dlp VTT captions (manual/uploader only) → timed beat heuristics → editorial topic synthesis (no ASR). Structure only; write original narration.