About Blind Spot & Brain Tricks
Every eye has a blind spot, where the optic nerve leaves the back of the eye and there are no light-sensing cells. With one eye closed and the right distance from the screen, a red dot vanishes. Then a line with a gap looks whole, because the brain paints in what it thinks should be there.
Stare at a colored heart for 20 seconds and a different colored heart appears on white paper, because the color cells you used got tired. Grey ghost dots flicker at the crossings of a black grid, two identical greys look different, and lines and circles of the same size look longer, shorter, bigger or smaller depending on what surrounds them.
The last experiment needs a sheet of paper rolled into a tube: look through it with one eye, hold your hand beside it, and you will see a hole in your hand, because the brain joins the two eyes' pictures. Each experiment ends with a short, clear explanation. Nothing in the game flashes. Made by an eye doctor.
Best for ages 6+
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