Think you can spot the difference between an object - let's say, a ripped up playing card - and a hand drawn replica of it? Should be easy, no?
Well to test the theory, watch this incredible video by artist Mark Crilley backwards, starting with the two side-by-side - then go from the beginning to have your mind completely blown.
Crilley, a Michigan-based photo-realist painter and illustrator, is completing a series of YouTube 'realism challenges' that test his abilities and use his background as a teacher to help the rest of us get better at doodling.
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Above is possibly his most impressive success yet, an illusion just as captivating as any magician's card trick we've ever seen.
What do you think?