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There are no receptor cells where the optic nerve leaves the eye, this creates a blind spot where things may not appear in our vision.

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A persons  visual cortex cell may respond more to a bar flashed in a tilt at 2 o' clock than one tilted at 1 or 3 o' clock. The brain has a preference when looking at certain objects.

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Looking at faces, houses, chairs or houses and chairs, activates different parts of the brain.

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When viewing this cube you can see it in different perspectives, either facing up towards the right or down towards the left.

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Doing several things at once, when the brain processes multiple things at once.

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Simulated neural networks respond to the illusory square and see it as a real square not 4 Pac-Manfaces.

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The theory that the retina contains three different color receptors - which when stimulated in combinations can produce the perception of any color. Combining light waves results in a back color but combining light

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When the cones and rods in the back of the eye cannot receive certain colors of light

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The theory that opposing retinal processes (red-green, yellow-blue, white-black) enable color vision.

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Perceiving familiar objects as having consistent color, even if changing illumination alters the wavelengths reflected by the object.