Danpiker22h 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 threadBill, organizer of stuff
@Danpiker TIL (from someone who said "this doesn't really work") - this doesn't work if your phone has a blue-light-blocking filter on it!
Jun 7 at 2:11pmWeb
Show threadderptron19h ago
@wcbdata @Danpiker Using a laptop. Yoga 910. Quick duck search leads me to believe there's no such filter on its screen. My night light shift software isn't on.

vOv
Show threadSolitha18h ago
@crazyeddie @wcbdata I found the effect was visible on one of my dual monitors, a new one, but not on the old one.