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

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@kims
Huh. I get darker purple for the dot I focus on and the others are a lighter purple.
The background does look like a shade is blue to me.
Mar 4 at 3:15amWeb