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Try these out for yourself, read the physical explanation, then try them out on your friends!
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Now you see it... - find your Blind Spot and "behead" your teacher! What on Earth is that? - Persistence of Vision Longer or Shorter? - that is the question! Have a Heart: Give Flowers - beauty in similarity Driving you Dotty! - black or white? Straight curves - or bent lines? Changing Size - and no animation! Coloured Flag - how many colours? Wavy Parallel Lines - or not? Broken Triangle - something fishy? In a Spin! - cute in pink NEW Amazing Optical Illusion Books - from Amazon