This simple animation above is made from seven stereo pairs arranged in such a way as to show how the placement of the subject in relation to the frame of the image affects where the stereo window will appear to exist. As explained in the STEREO WINDOW page, the stereo window is that imaginary plane at the frame of the picture. If an object protrudes into space in front of this window, we call this effect "coming through the stereo window". As long at the protruding object, like the wine glass with the hand - but not the body, protrude through the stereo window, we accept the image as "normal" and possible in our physical world. This is so because the hand and glass don't touch the outside frames of the picture. However, when the whole body starts to come through the stereo window, our mind cannot easily respond to an impossible situation, where part of the body comes through the window and the bottom is cut in half. So, in order to achieve a correct stereo window, objects that come through it must not touch the frame of the picture, as the hand and glass above.

Observe how the figure above is totally behind the window and gradually comes completely out through it and then goes back.

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