ADVANTAGES

Some of the scariest optical tricks involve the focusing of the lenses of the eye. Many scary optical illusions instruct the user to focus on a certain point of the picture, and blink a few times to achieve the effect. You then look to a wall, and see the image that was just on the screen appear on the wall beside you. Since the human brain has the tendency to associate images with patterns of formerly observed behavior (schemata), it is easy for us to see an image, and perceive a sound, a smell, or otherwise.

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