Many people think that we see with our eyes, hear with our ears and taste in our mouths, smell with our nose, etc. However science has long since concluded that this is not the case. What really happens is that we recieve information from ALL the senses and this is interpreted by our mind. It's widely believed that the mind has somekind of a "model" which it bases things on. The problem is that the model can't be corrected.
The mind-model says that the lines on a piece of paper form 3D image, but in reality they don't. In fact if you draw a cube like that on a piece of paper, the mind will alter the view you see as it tries to work out if the front side is really at the back. It will flick back and forth as you watch.
The same model says that a room will be square. So when someone makes one that is not (as in the squeeze video) the people appear to get smaller or bigger as they walk in it.
Hope that clears things up
Of course these kinds of visual tricks have been used to fake UFO pictures for sometime, which is important when looking at the evidence for ET that everyone takes this into account.