Most of us have two functioning eyes with which to see. Each eye sees something slightly different. By putting those two images together, the brain can compare and contrast the information resulting in a picture with depth and perspective.
With only one image, we may not correctly percieve how far away that stop sign is.
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2 comments:
Geeze, I must still be hungover 'cause I'm seeing double.
how come we don't hear double? or do we?
We do. It's called stereo.
Ah, but you must be referring to a misalligning of hearing in our left and right ears as is the case in double vision. I can only speculate but it might be because in the evolutionary timeline, eyes are thought to have developed much later than ears.
Ears are far more sensative to variation. To fool the eyes, one only needs to present an changing image more than 10 times a second. To fool the ears one needs to present a changing sound something like 20,000 times a second.
The sample rate of a CD is lots higher than for video. But video presents a broad field of information in each slice or frame whereas audio from a CD has a narrower slice.
The eyes are easily fooled. Trust your heart instead.
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