Lilac chaser: afterimages that invent a moving green spot

A 5-beat faceless video outline for “Lilac chaser: afterimages that invent a moving green spot” 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 — BioniChaos leads with a scene, not a definition dump
Make the mechanism explicit with one visual beat: further tweaks. Uh, this is much better. I can actually see the illusion. So, that's great…
Contrast or scale-up using the second reference (Knew Sauce): Stare at the cross in the middle. Don't move your eyes. Not even a little. There's a green…
Close on what the viewer can check themselves; original narration only — do not copy reference wording

Beat-by-beat structure

Hook (0:00–0:30): open on the puzzle of 'Lilac chaser' in one image.
Setup (0:30–2:00): define the key terms in plain words; borrow structure from BioniChaos, not lines.
Mechanism (2:00–5:00): walk the cause-and-effect with one diagram; cite the evidence beat (further tweaks. Uh, this is much better. I can actually see the illusi…).
Contrast (5:00–7:00): show the common myth or the second case from Knew Sauce.
Recap card: three takeaways + one 'check this yourself' action. Original narration only.

Reference videos

Coding Optical Illusions with AI: Building the Lilac Chaser in JavaScript dr06BM965Uk
How Easily Can Your Mind Be Hacked? (I'll Prove It 6 Times) UgDUf93bzlA

Method

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