[url=http://gizmodo.com/holy-crap-these-four-images-are-actually-just-one-singl-525258272?utm_campaign=socialflow_gizmodo_facebook&utm_source=gizmodo_facebook&utm_medium=socialflow]Source (Gizmodo)[/url]
If you stare at it long enough and really concentrate on connecting everything together, you can tell it's a single image. Very tough though.
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It's kind of easy to see. It's just that they use lots of 90 degree angles around the fake edges and they painted the walls and table different colors. Not really fair when you consider it.