Do you believe in ghosts, or are they just hallucinations? While most of these illusions are a result of how our brain and eyes respond to each other, we have also learned to create many tricks through science, technology, and art. The hi-tech visual illusions that impress us now where invented many years ago. Who knows what we will discover in the years to come? Includes: ghost illusions, afterimages, optical illusions, distortion illusions, illusions of depth in art, Pepper's ghost, holography, and kaleidoscopes.