The two photos are identical - even though it appears that the tracks are more vertical in the right photo and more slanted in the left one.
Similar in concept to the Leaning Tower of Pisa illusion.
Via within the crainium.
Reposted from 2009 to add this even more dramatic pairing:
Remember, the two photos are exactly identical.
Almost as awesome as this one. If you enjoy these, note you can access this blog's 62 posts about optical illusions from the categories section in the right sidebar.
Took me at least a minute to even consider that there weren't two photos!
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