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Before You Begin
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appears pale arrows ball bevelled glass bicycle wheels bowl cells circle coin color convex lens crease cross curved lines dark different angles disappear disc Doppler Effect edges elbow engine sends example experiment eyes and brain face is hidden ferent flashlight flat focus friends front glue green apple hold hole horizontal line images impossible figure inch index finger inside left eye left hand lens light rays light waves lines sloped look blurry middle mirror Moire effect Mother Hubbard move Nicholas Wade object Old Mother Hubbard optic nerve optical distortion optical illusion overlap paper patch pencil phane phantom piece of cardboard primary colors red filter red tomato refraction retina right eye scarf scissors shimmer shine side slightly different smell sound wave speeds squares sticky straight line taste things tiny triangle trick turn the book upside viewing box visual system wiggling