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The way that the brain sees color is also based around surrounding color. The above images has two squares labeled A and B. B is in a shadow, but A is not. B looks brighter than A because the surrounding squares are much darker than A and B, but A and B are the exact same color.

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In the eye, color is viewed as the opposite of what it really is, and is inverted in the brain, but can be viewed if you stare at the above image for a few seconds and look away. The cones in the retina are still sending the message to the brain for the inverted colors.

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In some people's eyes, the rods and cones may not be properly working, not allowing them to see certain colors, mostly yellow and green.

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Mixing physical colors will absorb all light, but only if they reflect white light. In the case that physical colors mix, they will absorb more light and produce black, subtracting color. When colored light mix, they combine their wavelengths to make white color, adding color.

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Some people have a hard time seeing one aspect of an object, so the parts of this one image are separated to be able to process them separately. The question is how the brain takes these parts in one image and processes them into one.

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There is no triangle in this image, only outlines that are the start and end of a triangle. The neural networks that respond to a triangle also respond to this image, making us think that there is a triangle here.

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The necker cube is a strange object that provides constant stimulus to your retina, which makes your perspective of the shape change every other second.

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Certain parts of the visual cortex work when exposed to certain objects, like chairs and houses.

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Certain parts of the visual cortex only respond to certain visual objects. A monkey was used to see which parts of the visual cortex lights up when shown different things.

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There are no receptor cells in the eye where the optic nerve connects, so when the image is full sized, and you look at the dot with one eye, the car will vanish due to not being able to even see it due to the blind spot.