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the brain expects each eye to be seeing the same object from different angles and merges the two to create a 3d view.Try this, hold your thumb out at arms length so it in front of your right eye. Look at the thumb and close your right eye. If you are right eyed you will see that each eye has a different view of your thumb. If your thumb doesn't appear to move to the right try closing the left eye instead, you may be left eye dominant.
Two other cool things to try with this:You can look straight down at the keyboard of your computer, and if you focus just right, adjacent letters will merge into keys that look like they have two letters superimposed, and the keyboard will appear to be about half as far away as it actually is (like a "magic eye" picture http://www.magiceye.com/saturn.jpg)Also, you can roll up a piece of paper into a tube (I think this works best with a diameter of about an inch). Look through the tube with one eye, and place your hand about two inches in front of the other eye. When you look out at a distance, a hole appears in the middle of your hand!