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How many purple dots do you see in the image above? Are they all the same hue? This new optical illusion, developed by biomedical optics engineer Hinnerk Schulz-Hildebrandt, is more revealing than you ...
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Stare at 100 dots for 30 seconds, and your brain starts lying about how many things it sees
Stare at two clusters of dots for 30 seconds. Then look at two identical groups of dots side by side. The group on the side you were staring at will look like it has fewer dots - even though both ...
Katie has a PhD in maths, specializing in the intersection of dynamical systems and number theory. She reports on topics from maths and history to society and animals. Katie has a PhD in maths, ...
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