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Where the optic nerve leaves the eye there are no receptor cells- creating a blind spot

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The monkey is looking at the rectangle which is oriented in three different ways. According to the picture, the monkey likes the rectangle tilted to the right the most because the cell's responses is higher to the rectangle leaning right.

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Looking at different people and objects activates different parts of the brain. This allows different parts of the brain to hold and process different pieces of information.

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As a person stares at the cube, their perception changes and the way the cube appears, changes. This occurs because the cube provides fairly constant stimulation to your retina and your perception, accompanying neural activity in your brain, will change every few seconds.

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the brain delegates the work of processing color, motion, form, and depth into different areas.

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When there's empty spaces between objects, the brain fills it in with an object that is easily stored in the brain.

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People with color deficient vision have trouble perceiving certain colors and the colors that aren't visible blend in with the colors which are visible to that person.

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The theory that the retina contains three different color receptors- one most sensitive to red, one to green, and one to blue.

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Theory that opposing retinal processes enable color vision.

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The ability of the eye to perceive familiar objects as having consistent color, even if changing illumination alters the wave-lengths reflected by the object.