A nice - yet simple - play of a perceptual (letter-digit) shift [ignore the inverted '3']. Courtesy of google.com on the celebration of the 40th Anniversary of Sesame Street.

An ambitious, eclectic design. Inspired mainly by perceptual shift and logotype. Difficult to decipher, but a fun exercise indeed.

A (very rough) draft of a perceptual shift ambigram. Either reads 'hungry' or 'thirsty'.