The document describes a series of optical illusion experiments conducted by Professor Vittorio Premuda to demonstrate how easily the human mind can be deceived. The experiments show that we can read jumbled words, perceive motion when there is none, see different colors or shapes based on context, and mistakenly see faces or objects in random patterns. The purpose is to illustrate that we cannot fully trust our senses and that subjective interpretation influences what we think we see. We are meant to question whether strange phenomena like ghosts could actually be illusions created by our minds.

1. OPTICAL ILLUSIONS (and why we see ghosts)

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13. Concentrate on the cross in the middle, after a while you will notice that this moving purple dot will turn green Look at the cross a bit longer and you‘ll notice that all dots except the green one will disappear.

19. * Follow the instruction below. * 1) Stare at the 4 little dots on the middle of the picture for 30 seconds * 2) then look at a wall near you * 3) a bright spot will appear * 4) twinkle a few times and you‘ll see a figure * 5) What do you see? Or even WHO do you see?