Home : Tune Toys : Expresso 
  Expresso takes a simple musical expression (literally "X") and mutates it. In each generation, transformations are applied to components of the expression. This is a fractal technique known as an L-system. The more generations there are, the larger and more complex the expression gets (and the longer it can take to compute). The output varies wildly, from boring to fascinating. Press "Mutate" a few times till you get something that looks interesting, then click on the image to play it. See Composer's Quarry for examples of output.

Transformations:
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After 20 generations the expression "X" became this:
((arpeggio(((transpose(transpose((echo((transpose((echo(((transpose(transpose((step(X,12) +transpose(transpose((X+transpose(X,7) ) ,4) ,7) ) ,4) ,4) +transpose(((transpose(X,-5) +transpose((transpose(X,-7) +transpose(X,-7) ) ,12) ) +transpose((transpose(transpose(X,4) ,-7) +transpose(((X+X) +transpose(X,7) ) ,12) ) ,12) ) ,4) ) +transpose(transpose((X+arpeggio(shuffle(X) ) ) ,-7) ,7) ) ,4,6) +echo(((transpose(X,-7) +(shuffle(X) +transpose(transpose(X,-7) ,7) ) ) +transpose(transpose(X,4) ,12) ) ,4,6) ) ,4) +transpose(((transpose((transpose(((X+transpose(X,7) ) +transpose(X,4) ) ,4) +transpose((X+transpose(X,12) ) ,12) ) ,4) |shuffle((((X|X) |(arpeggio(X) |echo(X,4,6) ) ) +transpose((echo(X,4,6) +step((X+transpose(X,7) ) ,12) ) ,7) ) ) ) +transpose(((echo((transpose(((((X+transpose(X,4) ) +transpose(X,7) ) +transpose(arpeggio(X) ,4) ) +transpose((X|X) ,7) ) ,-7) +arpeggio(transpose(echo(X,4,6) ,-5) ) ) ,4,6) +transpose(echo(transpose(step((X+transpose(X,7) ) ,12) ,-5) ,4,6) ,4) ) +transpose((echo((X|X) ,4,6) +transpose(shuffle((((X+transpose(X,4) ) +transpose(X,7) ) +transpose((X+transpose(X,12) ) ,12) ) ) ,7) ) ,7) ) ,12) ) ,12) ) ,4,6) +transpose(arpeggio(step(transpose(echo((arpeggio((((transpose(step(X,12) ,-5) +transpose(((X+transpose(transpose(X,4) ,7) ) |(X+transpose(X,12) ) ) ,4) ) +transpose(transpose(transpose(X,-7) ,4) ,7) ) +transpose((arpeggio(X) +(X+transpose(X,12) ) ) ,12) ) ) +transpose(shuffle(transpose(transpose(transpose(X,4) ,-5) ,4) ) ,7) ) ,4,6) ,4) ,12) ) ,12) ) ,-5) ,4) +transpose(arpeggio(transpose(arpeggio((shuffle(transpose(transpose(transpose((transpose(((((((X+transpose(X,4) ) +transpose(X,7) ) +transpose(transpose(X,-7) ,7) ) +transpose((X+(X+transpose(X,7) ) ) ,12) ) +transpose(echo(((((X+transpose(X,4) ) +transpose(X,7) ) +transpose(shuffle(X) ,4) ) +transpose(X,7) ) ,4,6) ,4) ) +transpose((((X|X) |X) +transpose((X+transpose(X,12) ) ,7) ) ,7) ) ,4) +echo(echo(arpeggio(X) ,4,6) ,4,6) ) ,4) ,4) ,-5) ) +transpose(transpose(transpose((transpose((step(transpose(transpose(X,4) ,-7) ,12) +transpose(transpose(arpeggio(X) ,-7) ,7) ) ,4) +transpose((echo(shuffle(step(shuffle(X) ,12) ) ,4,6) |transpose((X+transpose(transpose(X,-5) ,7) ) ,-5) ) ,7) ) ,4) ,-5) ,4) ) ) ,-5) ) ,4) ) +transpose((transpose(transpose(((((shuffle(transpose(transpose(transpose(echo(transpose(transpose(X,-7) ,-5) ,4,6) ,-5) ,4) ,4) ) +transpose(((transpose(shuffle(((transpose(X,4) +transpose(arpeggio(shuffle(X) ) ,4) ) +transpose(transpose(((X|X) +transpose(echo(X,4,6) ,12) ) ,-5) ,7) ) ) ,4) +transpose((transpose(transpose(arpeggio(step(X,12) ) ,4) ,4) |arpeggio(X) ) ,4) ) +transpose(arpeggio(transpose((((X+transpose((X+X) ,4) ) +transpose(X,7) ) |(transpose(X,-5) +transpose(X,4) ) ) ,4) ) ,7) ) ,4) ) +transpose((transpose((step((X|X) ,12) +transpose(transpose(transpose(((X|X) +transpose(X,7) ) ,-7) ,-5) ,12) ) ,-7) +transpose((arpeggio(arpeggio(((X+transpose(X,4) ) +transpose(X,7) ) ) ) +transpose(transpose((((transpose((transpose(transpose(X,4) ,-5) +transpose(X,7) ) ,-7) +transpose(transpose(transpose(X,-5) ,4) ,7) ) +transpose(((((X+transpose((X+transpose(X,12) ) ,7) ) +transpose((transpose((X+X) ,4) +((transpose(X,-5) +transpose((X+transpose(X,12) ) ,4) ) +transpose(X,7) ) ) ,4) ) +transpose(step(X,12) ,7) ) +transpose(transpose(X,-5) ,4) ) ,4) ) +transpose((shuffle(arpeggio((((X+transpose(X,4) ) +transpose(X,7) ) +transpose((X+X) ,12) ) ) ) +X) ,7) ) ,-7) ,12) ) ,-7) ) ,7) ) +transpose(arpeggio(step(transpose(echo(arpeggio(((step(X,12) +transpose(transpose(X,4) ,4) ) +transpose(transpose(X,4) ,7) ) ) ,4,6) ,-5) ,12) ) ,12) ) +transpose((transpose((((((transpose((X+transpose(X,7) ) ,-5) +shuffle(X) ) +transpose((transpose(arpeggio(transpose(X,4) ) ,-7) +transpose((transpose(X,-7) +transpose(X,-5) ) ,-7) ) ,4) ) +transpose(arpeggio(arpeggio(transpose((X+transpose(transpose(X,-5) ,7) ) ,-5) ) ) ,7) ) +transpose((((arpeggio((((X+transpose(X,4) ) +transpose(X,7) ) +transpose(transpose(X,-7) ,7) ) ) +arpeggio(transpose(X,4) ) ) +transpose(transpose(shuffle(((X+transpose(X,4) ) +transpose(X,7) ) ) ,4) ,12) ) +(((echo(transpose(transpose(X,4) ,-7) ,4,6) +transpose(transpose(((X+X) +transpose(X,12) ) ,4) ,7) ) +transpose(echo(arpeggio(arpeggio(X) ) ,4,6) ,4) ) +transpose(((transpose(X,-7) +transpose(transpose(X,-5) ,4) ) +transpose(transpose(X,-7) ,7) ) ,7) ) ) ,4) ) +transpose(((arpeggio(arpeggio(transpose(X,-7) ) ) +transpose(((step(X,12) +transpose(shuffle((X+transpose(X,7) ) ) ,4) ) +transpose(step(transpose(step(X,12) ,4) ,12) ,7) ) ,4) ) +transpose(transpose(echo(step(arpeggio(X) ,12) ,4,6) ,-5) ,7) ) ,7) ) ,-5) +transpose(echo((transpose((X+transpose(X,12) ) ,-7) +transpose(((transpose(transpose(X,-5) ,-7) +transpose(X,12) ) +(X+transpose(echo(X,4,6) ,12) ) ) ,12) ) ,4,6) ,-7) ) ,7) ) ,4) ,-7) +transpose(((step(((arpeggio(transpose(X,4) ) +transpose(step(transpose(X,-7) ,12) ,12) ) |(((X+transpose(X,12) ) +transpose(arpeggio(X) ,7) ) +transpose(transpose(transpose((X+transpose(X,7) ) ,4) ,-7) ,12) ) ) ,12) +transpose(transpose(echo(transpose((X+transpose(transpose(X,-7) ,12) ) ,-5) ,4,6) ,-7) ,12) ) +transpose(transpose(transpose((((((transpose(transpose((X+transpose(X,7) ) ,4) ,-5) +transpose((transpose(X,-7) +transpose(transpose(X,-5) ,12) ) ,12) ) +transpose((transpose(transpose(X,4) ,-7) |transpose(X,4) ) ,12) ) +transpose(transpose(transpose(transpose((transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,4) +transpose((transpose(X,-5) +X) ,7) ) ,-7) ,-5) ,-5) ,4) ) +transpose(transpose((transpose(X,-7) +transpose(echo(step(X,12) ,4,6) ,12) ) ,-7) ,7) ) +transpose(step(echo(X,4,6) ,12) ,4) ) ,-5) ,-5) ,7) ) ,4) ) ,7) ) ) +transpose((shuffle((((arpeggio(transpose(transpose(((((((step(transpose(X,4) ,12) +transpose((transpose(X,-7) +shuffle((X+transpose(X,7) ) ) ) ,4) ) +transpose(((X+transpose((X+transpose(X,12) ) ,7) ) +transpose((X+transpose(X,12) ) ,7) ) ,7) ) +transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,4) ) +transpose((((X|step(X,12) ) +transpose(transpose((((transpose(((X|X) |X) ,-7) +transpose(((transpose(X,-5) |((echo(X,4,6) +transpose(transpose(X,4) ,4) ) +transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,7) ) ) +transpose(echo(arpeggio(X) ,4,6) ,-5) ) ,12) ) +transpose((shuffle((X+transpose(X,12) ) ) +transpose((shuffle(transpose(X,4) ) +transpose(transpose(X,-7) ,12) ) ,12) ) ,4) ) +transpose(transpose(echo((X|step(X,12) ) ,4,6) ,4) ,7) ) ,-7) ,4) ) +transpose((((X+transpose(X,4) ) +transpose(X,7) ) |transpose(transpose(((X+transpose(X,12) ) +transpose((X|X) ,12) ) ,4) ,-5) ) ,7) ) ,4) ) +transpose((((transpose(transpose(transpose(X,4) ,-5) ,-5) +transpose(shuffle(((transpose(transpose((X+X) ,-5) ,-7) +transpose(transpose(transpose(X,-7) ,4) ,4) ) +transpose(((transpose(X,-5) +transpose((transpose(X,4) +(X+X) ) ,4) ) +transpose(transpose(X,4) ,7) ) ,7) ) ) ,4) ) +transpose((echo((X+transpose(X,7) ) ,4,6) +transpose(transpose(X,-5) ,7) ) ,7) ) +transpose((((transpose((arpeggio(shuffle(transpose(X,-5) ) ) +transpose(step(arpeggio(X) ,12) ,12) ) ,-5) +transpose(transpose(arpeggio(transpose(X,-7) ) ,4) ,12) ) +transpose((transpose(transpose(X,4) ,-7) +transpose(arpeggio((transpose(X,-5) +transpose(transpose(((X+transpose(X,7) ) +transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,12) ) ,4) ,12) ) ) ,7) ) ,4) ) +transpose(echo(echo(transpose(((transpose((X+transpose(X,7) ) ,4) +transpose(shuffle(echo(X,4,6) ) ,4) ) +transpose(((step(X,12) +transpose(X,4) ) +transpose(X,7) ) ,7) ) ,-7) ,4,6) ,4,6) ,7) ) ,7) ) ,7) ) +(((((step(X,12) |transpose(transpose(X,4) ,4) ) +transpose(transpose(step(X,12) ,-7) ,7) ) +transpose(((X|transpose(arpeggio(X) ,-7) ) +transpose(X,12) ) ,7) ) +((arpeggio(X) +transpose(X,12) ) +transpose(transpose(X,4) ,7) ) ) |step((X+transpose(X,7) ) ,12) ) ) ,-5) ,-5) ) +transpose(transpose(transpose((echo(arpeggio(echo(((X+transpose(X,4) ) +transpose(echo(X,4,6) ,7) ) ,4,6) ) ,4,6) +transpose(arpeggio(transpose(transpose((X+X) ,-7) ,-5) ) ,12) ) ,4) ,4) ,4) ) +transpose(transpose(((transpose((step(transpose(transpose(X,4) ,4) ,12) +transpose(transpose(transpose(echo(transpose(X,4) ,4,6) ,-7) ,4) ,12) ) ,-7) +transpose((transpose((transpose(((X+transpose(arpeggio(X) ,4) ) +transpose(X,7) ) ,4) +transpose((((X+transpose(X,4) ) +transpose(X,7) ) +((X+transpose(X,7) ) +transpose(transpose(X,-5) ,7) ) ) ,12) ) ,-7) +transpose(shuffle(((shuffle(X) +transpose(step(X,12) ,4) ) +transpose(transpose(X,-7) ,7) ) ) ,7) ) ,4) ) +transpose(((((arpeggio(transpose(shuffle(arpeggio(X) ) ,4) ) +transpose((((transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,4) +transpose(transpose((arpeggio(X) +transpose((X+transpose(X,7) ) ,12) ) ,-7) ,7) ) +transpose((((X+transpose(X,4) ) +transpose(X,7) ) +transpose(shuffle(arpeggio(X) ) ,12) ) ,7) ) +transpose(transpose(((transpose(X,-5) +transpose(echo(X,4,6) ,4) ) +transpose((X+transpose(X,12) ) ,7) ) ,-5) ,7) ) ,4) ) +transpose(((transpose(transpose(echo(shuffle((X+transpose(X,7) ) ) ,4,6) ,4) ,-5) +transpose((((transpose(transpose(step(X,12) ,4) ,-5) +transpose(shuffle((X|X) ) ,4) ) +transpose(echo(step(X,12) ,4,6) ,7) ) |(transpose(((X+transpose(X,7) ) +transpose(X,7) ) ,-5) +transpose(transpose(step(transpose(X,-5) ,12) ,4) ,7) ) ) ,4) ) +transpose(step(shuffle(transpose(arpeggio(X) ,-5) ) ,12) ,7) ) ,7) ) +transpose(step(transpose((step(arpeggio(arpeggio(X) ) ,12) +transpose((arpeggio(transpose(X,-5) ) +transpose((X+transpose(echo(X,4,6) ,7) ) ,12) ) ,7) ) ,-5) ,12) ,12) ) +transpose((transpose(echo((((transpose(X,-5) +transpose((transpose(X,-5) |((X+transpose(X,4) ) +transpose(X,7) ) ) ,4) ) +transpose(arpeggio(X) ,7) ) +arpeggio((transpose(X,-7) +shuffle(X) ) ) ) ,4,6) ,4) +transpose(transpose(transpose(transpose(((transpose(transpose(transpose(shuffle(X) ,-7) ,4) ,-7) +transpose(step(transpose((X+transpose(X,12) ) ,-7) ,12) ,4) ) +transpose(transpose(transpose(echo(X,4,6) ,-7) ,-5) ,7) ) ,-5) ,4) ,4) ,12) ) ,12) ) ,7) ) ,-5) ,7) ) +transpose(((echo(((((((transpose((echo(echo(transpose(echo(transpose(X,-5) ,4,6) ,-7) ,4,6) ,4,6) +transpose(shuffle(transpose(transpose(X,4) ,-5) ) ,7) ) ,-5) +transpose((transpose(X,-7) +transpose((((((step(X,12) +transpose(transpose(X,4) ,7) ) +transpose(arpeggio(X) ,7) ) +transpose((echo((X+transpose(transpose(X,-5) ,7) ) ,4,6) +transpose((step(X,12) +transpose(X,-5) ) ,12) ) ,4) ) +transpose(((X+transpose(X,7) ) +transpose(step((X+transpose(X,7) ) ,12) ,7) ) ,7) ) |shuffle(transpose(shuffle(arpeggio(X) ) ,4) ) ) ,12) ) ,12) ) +transpose(((transpose((((step(((X+transpose(shuffle(X) ,4) ) +transpose(X,7) ) ,12) +transpose((echo((X+transpose(X,12) ) ,4,6) +((X+transpose(X,4) ) +transpose(X,7) ) ) ,7) ) +transpose(echo(echo(X,4,6) ,4,6) ,4) ) +transpose((shuffle(step(X,12) ) |transpose(X,-7) ) ,7) ) ,4) +transpose(((X+transpose(transpose(X,-5) ,-5) ) |((transpose((((X+transpose(X,4) ) +transpose(X,7) ) +transpose(X,12) ) ,-7) +transpose((X|transpose(X,-5) ) ,12) ) +transpose(echo((X+transpose(X,12) ) ,4,6) ,7) ) ) ,12) ) |((echo((((transpose(X,-5) +transpose(transpose(X,-5) ,4) ) +transpose(transpose((X+transpose(step(X,12) ,7) ) ,-5) ,7) ) |transpose(((transpose(X,-7) +transpose((X+X) ,4) ) +transpose(((echo(X,4,6) +transpose(X,4) ) +transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,7) ) ,7) ) ,-7) ) ,4,6) +transpose(transpose((arpeggio(transpose(X,-5) ) |transpose(transpose(X,-5) ,-5) ) ,4) ,4) ) +transpose((((((transpose(transpose(transpose(X,-5) ,-7) ,4) +transpose(transpose(((echo(X,4,6) +transpose((X+X) ,4) ) +transpose(shuffle(X) ,7) ) ,-7) ,4) ) +transpose(arpeggio(shuffle((X|X) ) ) ,7) ) +transpose(transpose(X,4) ,4) ) +transpose(((transpose(((X|X) +transpose(X,12) ) ,4) +transpose((((X+transpose(X,7) ) +transpose(X,4) ) +transpose(X,7) ) ,4) ) +transpose(X,7) ) ,7) ) +((step(transpose(transpose(X,4) ,-7) ,12) +echo((X|X) ,4,6) ) +transpose(transpose(((transpose(X,4) +step(X,12) ) |shuffle(X) ) ,-5) ,12) ) ) ,7) ) ) ,4) ) +transpose(transpose(arpeggio(transpose(arpeggio(transpose(X,4) ) ,-7) ) ,-7) ,7) ) +transpose(transpose(((((X+transpose(X,12) ) +transpose(transpose(transpose(X,-5) ,4) ,4) ) +transpose(transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,-5) ,7) ) +transpose((shuffle(X) +transpose((step(transpose(X,4) ,12) +transpose(X,12) ) ,12) ) ,7) ) ,4) ,12) ) +transpose(((shuffle(transpose((arpeggio(arpeggio(X) ) |transpose(shuffle(((X+transpose(X,7) ) +transpose(X,12) ) ) ,4) ) ,4) ) +transpose(transpose(transpose(shuffle(transpose(transpose((X+transpose(X,7) ) ,-5) ,-5) ) ,4) ,4) ,4) ) +transpose(transpose((arpeggio(transpose(transpose(X,-5) ,-5) ) +transpose((shuffle(transpose((X+X) ,-5) ) +transpose(((echo(X,4,6) +(X+X) ) |transpose(X,4) ) ,7) ) ,12) ) ,-7) ,7) ) ,4) ) +transpose(((transpose(((transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,-5) +step(echo(shuffle((((X+transpose(X,12) ) +transpose((X+X) ,4) ) +transpose(X,7) ) ) ,4,6) ,12) ) +((transpose(transpose(transpose(transpose((X+transpose(X,12) ) ,4) ,4) ,-7) ,4) +transpose(step(arpeggio((transpose(X,4) +transpose(((X+transpose((X+X) ,4) ) +transpose((X+transpose(X,12) ) ,7) ) ,7) ) ) ,12) ,4) ) +transpose(transpose((transpose(transpose((X+transpose(X,12) ) ,-5) ,-5) +transpose(transpose(X,-7) ,4) ) ,4) ,7) ) ) ,-7) +transpose(arpeggio(transpose(X,-5) ) ,4) ) +transpose(transpose(transpose((((transpose(transpose(arpeggio(((X+transpose(X,12) ) +transpose(transpose(X,4) ,12) ) ) ,-7) ,4) +transpose(shuffle(echo(transpose(X,-7) ,4,6) ) ,4) ) +transpose(transpose(step((X+transpose(transpose((X+transpose(X,7) ) ,-5) ,12) ) ,12) ,-7) ,7) ) |transpose((transpose(transpose(shuffle(X) ,-7) ,-7) +transpose(transpose(transpose(transpose(X,4) ,-5) ,-5) ,12) ) ,4) ) ,-7) ,-5) ,7) ) ,7) ) ,4,6) +transpose(transpose(transpose(step(((X+transpose((((X+X) +transpose(shuffle(X) ,4) ) +transpose(arpeggio(X) ,7) ) ,4) ) +transpose(step(transpose(shuffle(X) ,4) ,12) ,7) ) ,12) ,-7) ,-5) ,4) ) +transpose(transpose((transpose(echo(transpose(transpose(transpose(X,-7) ,4) ,-7) ,4,6) ,-5) +((shuffle(shuffle(((X+transpose(X,4) ) +transpose(X,7) ) ) ) +transpose((step(shuffle(step(((X+transpose(X,4) ) +transpose(X,7) ) ,12) ) ,12) |((((X+transpose(X,7) ) +step(X,12) ) +transpose((echo(X,4,6) +transpose(X,7) ) ,4) ) +transpose(arpeggio(arpeggio(X) ) ,7) ) ) ,4) ) +transpose(step((step(((X+transpose(X,4) ) +transpose(X,7) ) ,12) +transpose(echo(transpose(X,-5) ,4,6) ,12) ) ,12) ,7) ) ) ,4) ,7) ) ,7) ) ) +transpose(transpose(step((step(transpose(transpose(echo(X,4,6) ,-7) ,4) ,12) +transpose(transpose(transpose(transpose(((transpose((X|X) ,4) +transpose(echo(((X+transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,4) ) +transpose(X,7) ) ,4,6) ,7) ) |arpeggio(arpeggio(transpose(X,-5) ) ) ) ,4) ,-5) ,-5) ,7) ) ,12) ,-5) ,12) ) ,12) ) +transpose(echo(arpeggio(transpose(transpose((transpose(((transpose((transpose(transpose(X,-7) ,4) |transpose((((X+transpose(X,12) ) +transpose(X,4) ) +transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,7) ) ,-7) ) ,-7) +transpose((shuffle((shuffle(arpeggio(X) ) +transpose(((X+transpose(X,7) ) +X) ,12) ) ) +transpose((transpose(transpose(X,-5) ,-5) +transpose((transpose(step(transpose(X,4) ,12) ,-5) +(echo(transpose((X+transpose(X,12) ) ,-5) ,4,6) +transpose(echo(step(X,12) ,4,6) ,12) ) ) ,12) ) ,7) ) ,7) ) |(shuffle(echo(((transpose(shuffle(X) ,4) +transpose(transpose(transpose(X,4) ,-7) ,4) ) +transpose(transpose(transpose(X,-7) ,-5) ,7) ) ,4,6) ) +transpose((echo(echo(arpeggio((X+transpose((X+transpose(X,7) ) ,12) ) ) ,4,6) ,4,6) +transpose(arpeggio(step((((X+X) +transpose(X,4) ) +transpose((X+X) ,7) ) ,12) ) ,12) ) ,12) ) ) ,-7) +transpose((transpose(((step(((transpose((X+transpose((X+transpose(X,7) ) ,7) ) ,4) +transpose(echo(X,4,6) ,-5) ) |arpeggio(transpose((X+transpose(X,12) ) ,4) ) ) ,12) +transpose((shuffle((echo(X,4,6) +transpose(transpose((X|X) ,-5) ,12) ) ) +transpose(step((transpose((X+transpose(X,7) ) ,-5) +(echo(X,4,6) +transpose(X,7) ) ) ,12) ,7) ) ,12) ) +transpose(step(transpose(arpeggio(X) ,-5) ,12) ,12) ) ,4) +transpose(transpose(transpose(echo(transpose(transpose(X,4) ,-7) ,4,6) ,4) ,-5) ,12) ) ,7) ) ,-7) ,4) ) ,4,6) ,7) )
random seed used was 153858450

The algorithm for Expresso is written in KeyKit, and here's the source code.