Kim ScheinbergMar 1

This is a very cool optical effect

Whichever dot you focus on looks purple while the others look blue

As someone whose eyes have been "settling" from cataract surgery followed by a superficial keratectomy in one eye, and has noticed my vision changing daily at various focal points, this is fascinating

https://arxiv.org/pdf/2509.11582v2

Show threadToilet full of bugs
@kims I don't get this illusion at all! I thought it might be because I'm on PC and the image dimensions make me think it's meant to be shown on a phone screen, so I zoomed out. Still all looks purple. I can't make myself see any blue!
Mar 1 at 9:46pmWeb
Show threadKim ScheinbergMar 1
@ephemeromorph
I read the paper but am not smart enough to understand why it would not work on certain people
Show threadLoïc DenuzièreMar 4
@ephemeromorph @kims I'm on my phone and I don't see anything either, they're all purple no matter how hard I focus on one.
Show threadMees 🔻Mar 10
@tarmil @ephemeromorph @kims I had to turn off all the eye-protecting filters on my phone. But then, it worked. So chances are it's pretty colour-specific