Another way to see how much your brain is involved in the visual process is to look at optical illusions, even something as simple as this line rendering of a transparent cube:
to flip back and forth in space. This is an example of your brain failing to properly interpret the visual data that your eyes have collected.
Your eyes are properly registering a series of lines on a flat piece of paper, but your brain is stepping into the process. It notices that the arrangement of these lines usually represents a particular 3D object—a cube—as if they were truly a three-dimensional shape. Because it isn't actually a cube, your brain gets confused, and the orientation of the cube appears to flip around. This is a prime example of how your brain manipulates your visual experience after your eyes have already gathered up raw visual data.
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