Watch the version with flickers first: http://www.youtube.com/watch?v=BLYsXpD8sSc.
Change Blindness test produced by the Visual Cognition lab (Uni. of Edinburgh). A version of this test was presented on BBC1's Bang Goes The Theory (Mon 28th Sept, 2009). Watch this version of the test without the flickers to see how the changes 'pop out'. Go to http://continuityboy.blogspot.com/ for an explanation of the effect.
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