Optical illusion test: Blue, purple or red-- what's the colour of this dot and the science behind it

A biomedical optics engineer discovered a visual illusion where purple dots appear bluer in peripheral vision. This ...
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Test your visual acuity in 22 seconds! Can you spot the hidden panda in this tricky illusion drawing?

Optical illusions with hidden images are amazing for testing your visual powers. These illusion images challenge your brain's perception, boost concentration, enhance pattern recognition, and ...