Double Vision: Fake Finger
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The perks of possessing a pair of peepers. Ever wonder why we have two eyes instead of just one? Because our eyes are in two slightly different locations, they each perceive things a bit differently. Each one relays a separate image to our brain, which combines the two pictures into one, giving us a truer view of the world around us. This helps us see objects more completely, as well as determine depth and distance.
How to play
Have your child hold her index fingers together about 6 inches in front of her eyes. Tell her not to focus on her fingers, but to look directly beyond them. She'll see a short, double-ended finger between her index fingers.
What's going on: By not focusing on her fingers, she is preventing her brain from combining her eyes' two views of them into one. Instead, the two separate finger images overlap imperfectly, creating an illusion of a third finger.
