First test your sound output by pressing the appropriately named button 'Test'. You must hear a clear 'tink' sound. If not, go to another illusion.
The phenomenon: Press buttons '1' and '2' repeatedly ad lib. Try to determine the path of the blue balls. Are they crossing like so 'X', or do they bounce off each other '> <'?
Chances are: When there is no accompanying sound, the crossed path is seen, with the sound a bounce ('> <') is perceived.
Play Motion Bounce Free Online at Arcade Boss Games.
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