There is a science of illusions, and this science is gestalt psychology. Around 1912 it discovered and stated the gestalt laws that explain why film projectors can create movement illusions on screens. That is why gestalt psychology offers the best scientific approach to Web phenomena. It is the expert science of perceptual illusions. The illusions created by multimedia computers are of the same kind as the ones created by film projectors.
Virtual reality is a clear-cut case.
It is a pure perceptual illusion not existing in real space-time. It can only exist within the perceptual space constituted by the gestalt laws. Such illusions have a natural basis in the phenomena of camouflage. When the deer only sees trees where there is a tiger, then natural virtual reality is at work. This is not to deny that digital computer science was a condition for the development of the Web.