eChalk Optical Illusions
Interactive classroom illusions you can drag, toggle and pause, which makes the effects considerably harder to dismiss.
Opens in a new tab. We do not control this site and it may have changed since we catalogued it.
How to get the most from it
eChalk Optical Illusions sits in Optical Illusions under Weird, filed as coffee break.
- Set aside five to fifteen minutes and give it your proper attention.
- Use a laptop or desktop computer — we file it as desktop only.
- It works with the sound off, so it is fine on a train or in a quiet office.
- No account needed — you can start without signing up.
- Go in expecting something clever and mesmerising.
About this category: Illusion collections and perception demos. The good ones keep working after you have been told exactly how they work.
Good for
- Filling a coffee break properly
- Being impressed by a clever idea
- Watching something hypnotic for a while
- A quiet break at your desk
- Trying it with zero commitment
eChalk Optical Illusions: quick answers
Is eChalk Optical Illusions free?
Yes. eChalk Optical Illusions is free to use and needs no account.
Do I need an account to use eChalk Optical Illusions?
No. You can use eChalk Optical Illusions without signing up for anything.
Does eChalk Optical Illusions work on a phone?
Not well. We file eChalk Optical Illusions as desktop only, so open it on a laptop or desktop computer.
Is eChalk Optical Illusions safe for work?
Yes, we file it as safe for work. It also works muted.
How long does eChalk Optical Illusions take?
We file it as "Coffee break": Five to fifteen minutes of proper attention.
More in Optical Illusions
All 13 in Optical IllusionsTim Rowett's collection of optical toys and physics oddities, each demonstrated on camera by a man visibly delighted with all of it.
- 1 hr+
- Sound on
A philosophy department's catalogue of illusions, each with what it is, what it demonstrates, and the argument still going about it.
- 10 min
Catalogue of impossible figures, ambiguous objects and Escher-adjacent architecture, kept up by one very devoted collector.
- 10 min
The official Escher archive: the impossible staircases, the tessellations, and his own notes on how he worked them out.
- 10 min
Same mood: clever
All clever sitesA museum of Google easter eggs that Google removed — gravity, the barrel roll, the mirrored search — all restored and working.
- 10 min
- Desktop
Every Google emoji mashup, searchable — pick two and get the official illustrated hybrid back as a PNG.
- <1 min
Upload a photograph and it rebuilds the entire thing out of emoji, colour-matched one tile at a time.
- 2 min
- Desktop
Search, click, paste, with nothing else on the page competing for attention, which is precisely the point.
- <1 min
Keep exploring
Category
Time and mood
Have a site of your own? Suggest it for Detour or browse the AltFTool backlinks hub.