Jack Stulz's Mirror Canon uses only extended bow techniques, and is read upside down and backwards by the second player. From Jack's notes on the piece:
Player 2 flips the music upside down and reads everything backwards and in a physical inversion. Thus the material player 1 plays at the beginning will be mirrored by player 2 at the end (and vice versa). This piece was composed a la George Perec using the knights tour from chess as solved by the 18th century hoax chess automaton "the Turk."