Remarkably, the word itself can be made into an ambigram.
The cover to the DVD version of "Princess Bride" is also an ambigram.
John Langdon designed this one, which reads "Philosophy Art & Science" right side up or upside down.
Wikipedia about Ambigram
There's a nice collection online in "An Optical Illusion"
4 Comments on Gurney Journey: Ambigram
http://www.scottkim.com.previewc40.carrierzone.com/inversions/"