Just imagine a place in which things turned upside down are still right-side up, where the laws of nature as we know them are suspended, ignored, or even expanded. That's the fantastic universe of Eye Twisters , which features incredible ambigrams--calligraphic designs that have not just one, but two interpretations at once. Though these visual conundrums have existed for years, they were virtually unknown until recently, when John Langdon--who provided...