Nothing like a good geometrical-optical illusion! The alteration of the black and white lines and corner shapes causes your brain to get confused about the perspective.
Here are a few other good classic examples.
Image: YouTube / MindYourDecisions
These columns are straight (and not moving)
Have you ever seen the Pigeon Neck illusion?
This one's animated, so go and check out the interactive Pigeon Neck illusion at Michael Bach's website. In the animation above you see "pigeons" craning their neck while scurrying along,… READ THE REST
Mindbending optical illusion: Which of these buses is going faster?
Which of these "buses" is moving faster? While they appear to be in a "race," they are actually moving at the same speed, as revealed when the background becomes solid… READ THE REST
This mind-melting optical illusion is called the Hermann Grid
Mathematician/author Cliff Pickover posted the mind-melting optical illusion below. It's an example of the "Hermann grid illusion," first described by Ludimar Hermann in 1870 when he was reading a book… READ THE REST
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