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Try these out for yourself, read the physical explanation, then try them out on your friends!
Now you see it... - find your Blind Spot
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 Books - from Amazon