Ignoring the door knob, how many circles are on the Optical Spy office door? If you stare at the door sign they should soon appear.
OK this is not easy question in fact it doesn't really have a correct answer. Well, if it does we don't know it and we designed it! Still it falls into the category of unusual, which we like a lot.
These arches are very unusual and the sunshine seems to be from a different place on the top compared with the bottom.
Stare intently at the red dot at the center and the blue circle will disappear. Just like Troxler's fading shown here
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