5.Why We See In 3-D
Three-dimensional vision helps with depth perception. Each eye views an object from a slightly different angle. Called binocular disparity, it helps the brain to gauge depth. It’s vital but not the only way to view the world in 3-D.
The parallax phenomenon is the difference in speed at which things move as you pass them. It’s most notable while driving: nearby trees will shoot past, while a radio tower in the distance moves at a snail’s pace. Other ways to calculate an object’s range include their size, being able to see more detail in closer objects, parallel lines that appear to converge, and the way items stand in relation to each other.
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