Which Way Is This Train Going?

The train might move in a different direction each time you look at it. Stare long enough and you can make the train change directions. There is no correct answer, because this .gif is only four frames long; the optical illusion is in your brain. However, there is that one guy who recognized the subway station and just knew which direction the train comes there. -via Geeks Are Sexy


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It's coming towards us because you can see a red light in the tunnel from the direction the train is coming from.

If the train was travelling away from us, the light would be green or not exist.
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I used to stare at the interlaced scan lines on my TV and mentally make them change direction.

The gif above does show that motion blur has no 'head' and 'tail,' as many imagine it does.
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Check out Twaggies' very funny clip:

Om Nom - Twaggies by Twaggies
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