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As readers of this site should well know, I have a weakness for word play. Most forms of word play have to do with the way we use words or put them together (puns, palindromes, and anagrams being pertinent examples). Amibigrams, however, are unique in that they deal with the written word.

An Ambigram is, to quote Ambigram.com, "a word or words that can be read in more than one way or from more than a single vantage point, such as both right side up and upside down."

Essentially, Ambigrams are a rather remarkable form of caligraphy. Some ambigrams contain the same word from multiple vantages, while others "encode" multiple words (such as True and False). Here are some of the better Ambigram sites that I've found (I strongly recommend printing out the non-animated examples so that you can more easily rotate them):

• JohnLangdon.net
• Inversions by Scott Kim (includes some very nice animated ambigrams)
• Kevin Pease's Ambigrams
• Eye Twisters
• Western Washington University (student created ambigrams)
  
• The Ambigrammatic (an ambigram generator)
  

Special thanks to Karen Brown and Natalie Ramsey for pointing me to John Langdon's homepage.