@sinistral said:
Mine's really easy, and not nearly as creative as dhromed's. My user name is sinistral, which means 'from the left' or 'left handed.' Ever since I've discovered the word, I've liked it, because I myself am left handed. The avatar is simply a human left hand I found using Google Images and edited to make the message board software happy as to size and format.
Although I imagine you know this, the image you use is a work by M.C. Escher, whose work is mostly about Math, or aspects of math, that relate to patterns of abstractions or concepts which experience transformations, and/or are self-referential in some way.
There's a great book by Douglas Hofstadter (won the Pulitzer I believe) called Godel, Escher and Bach, an Eternal Golden Braid, that relates the self-referential & transformational nature of Escher's works to similar characteristics in Bach's musical compositions, and both of those to the fundemental idea of Kurt Godel's famous incompleteness theorem.