[zeroca]

To illustrate the fact that the pictures of both eyes are laid over each-other, is another test:
Take a little pipe (diameter 3-4 cm, length – 10-12 cm); look through it with one (right) eye; place your left palm before your eyes so that it touched farthest from eyes end of the pipe with its cubital part (consult the rough sketch below). Open/close the right eye several times (make sure that with your left eye you are watching your palm undamaged – without hole in it).
Open right eye (i.e. both eyes) finally.
You see a hole in your palm, i.e. you are looking through it, and when moving the palm nearer to left eye along the pipe, you see that hole penetrates the central part of palm.