Danpiker16h ago

This illusion was new to me. Does whichever dot you look at turn more purple?

Pretty neat how clearly this lets you see the reduced sensitivity to blue light in the very centre of your vision.

https://www.schulz-hildebrandt.com/9-purple-dots-illusion/

https://arxiv.org/abs/2509.11582

Show threadConchoid
@Danpiker i don't see it
12:15pmWeb
Show threadTrickpaw14h ago
@conchoid @Danpiker this has never worked for me either!
Show threadThe Sleight Doctor 🃏🍉8h ago

@Pikestreet @conchoid @Danpiker Nor me. I have a collection of optical illusions that do fool me though!

Lemme find them...

Show threadThe Sleight Doctor 🃏🍉8h ago

@Pikestreet @conchoid @Danpiker

This is a good one.

Show threadThe Sleight Doctor 🃏🍉8h ago

@Pikestreet @conchoid @Danpiker

This is also a good one.

Show threadTrickpaw8h ago
@ApostateEnglishman Lots of them work on me, just not this one for some reason!
Show threadThe Sleight Doctor 🃏🍉8h ago

@Pikestreet This one really bends my tiny mind!

It's not a spiral, but perfect concentric circles. 🤯

Show threadderptron13h ago

@conchoid @Danpiker I had to work pretty hard at it.

I had to open the many dots image alone and zoom in. Then if I stare at a dot really hard it does appear to be ever so slightly darker a purple than the rest.

My eyes hurt now and everything is blurry. Don't do this at home.

Show threadDgar13h ago
@crazyeddie @conchoid @Danpiker
*only do this at home.
Show threadFediThing 7h ago

@crazyeddie @conchoid @Danpiker

Weirdly it worked better for me when the image was small in my timeline, the purple was much clearer, and zooming in made it less clear. I guess different people's brains have slightly different perceptions?

Show threadTrueNorthSpice 🇨🇦12h ago

@conchoid @Danpiker

Me either.

Show threadJean-Baptiste Fidélia9h ago
@conchoid @Danpiker that's interesting. What do you see exactly when you look at it? What colors do you see? I'm curious.
Show threadConchoid9h ago
@jeantranscene @Danpiker
Grey-blue-ish background and blue dots. On a computer screen, but the screen is not that bad. Also don't know about color vision impairment to have.
Show threadjakllsch3h ago
@conchoid @Danpiker It worked for me on a AMOLED phone, but didn't work for me on a IPS LCD laptop.