The S-cones make up only 8–12 percent of all cones in the retina and are almost completely absent in the absolute center of ...
Boing Boing on MSN
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 ...
How many purple dots do you see in the image above? Are they all the same hue? This new optical illusion, developed by ...
Schulz-Hildebrandt, a biomedical optics engineer at Harvard Medical School, ran with his observation and developed an ...
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