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The Fact
The illusion of movement is strong with this one, my friends. The placement of the shadows on these diamonds and the resulting separation of the same color makes our brain see movement. However, unlike some of the images coming up, you actually have to move in order for your brain to imagine that the diamonds are moving in your peripheral vision.
How to understand the expression - Credit for free! Well, we’re just at the bank, we give you money, but you don’t return them to us in general!