Basically stare at the dot in the centre of the negative image (pink hulked-out Peter Griffin) until the picture changes colour (it's a .gif so it'll change back and forward by itself every 10 seconds). The gimmick is that you'll end up seeing the picture full colour when it changes, but look even slightly away and you'll notice that there's no colour at all... the whole thing is grey and it's just your eyes/brain doing their stuff to fool you. Nothing special but cool the first time you try it!
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