Post · queer*it social

@Danpiker@mathstodon.xyz · letzten Monat

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

Blue dots on a greyish blue background

When Purple Perceived Only at Fixation: A Fixation and Distance-Dependent Color Illusion

In this paper a novel optical illusion is described in which purple structures are perceived as purple at the point of fixation, while the surrounding structures of the same purple color are perceived toward a blue hue. As the viewing distance increases, a greater number of purple structures revert to a purple appearance.

Hinnerk Schulz-Hildebrandt

The 9 Purple Dots Illusion

Are this Dots Blue or Purple? Here you can find background information about the recently published "9 Purple Dot Illusion"

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