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:
((transpose(arpeggio(((transpose(((shuffle(transpose(transpose(echo(X,4,6) ,4) ,4) ) |transpose(shuffle(transpose(((step((X+transpose(X,12) ) ,12) +transpose(step(transpose(X,-7) ,12) ,4) ) +transpose(X,7) ) ,-7) ) ,4) ) +((step(transpose((transpose(shuffle(X) ,-7) +transpose((arpeggio((X+X) ) +(echo(X,4,6) +transpose(transpose(X,4) ,7) ) ) ,7) ) ,-5) ,12) +arpeggio((((echo(X,4,6) +transpose(X,4) ) +transpose(X,7) ) +(((X+X) +transpose((transpose(X,4) +transpose((X+X) ,12) ) ,4) ) +transpose(arpeggio(X) ,7) ) ) ) ) +transpose(echo((shuffle((((arpeggio(X) +transpose(transpose(X,-7) ,4) ) +transpose(echo(X,4,6) ,7) ) |transpose(X,4) ) ) +transpose(X,7) ) ,4,6) ,7) ) ) ,-7) +((step(transpose((((transpose(X,-5) +transpose(X,-5) ) +transpose(((transpose(X,-7) +transpose(echo(shuffle(transpose(X,-5) ) ,4,6) ,4) ) +transpose(arpeggio(X) ,7) ) ,4) ) +transpose(transpose((((X+transpose(X,7) ) +transpose(X,4) ) +transpose((X+transpose(X,7) ) ,7) ) ,4) ,7) ) ,-5) ,12) +transpose(transpose(transpose(transpose(transpose((arpeggio(((X+transpose(X,4) ) +transpose(X,7) ) ) +(((X+transpose(X,7) ) +transpose(arpeggio(X) ,4) ) +transpose(step(X,12) ,7) ) ) ,-5) ,-5) ,-5) ,4) ,7) ) |transpose((transpose((arpeggio(step(step(step(X,12) ,12) ,12) ) +transpose(((transpose((X|X) ,-5) +transpose(transpose(echo(X,4,6) ,-7) ,4) ) +transpose(echo(transpose(X,4) ,4,6) ,7) ) ,12) ) ,-7) |echo(transpose((shuffle(X) +transpose(((((X+transpose(X,4) ) +transpose(X,7) ) +transpose(X,4) ) +transpose(transpose(X,-7) ,7) ) ,7) ) ,-7) ,4,6) ) ,-5) ) ) +((((((transpose(echo(echo(transpose(transpose(arpeggio(X) ,4) ,4) ,4,6) ,4,6) ,-7) |(shuffle(transpose(((((X+transpose(X,7) ) +transpose((X+X) ,4) ) +transpose((X+transpose(X,7) ) ,7) ) |transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,4) ) ,-5) ) +(transpose(((transpose(shuffle(transpose(transpose(X,-7) ,4) ) ,-7) +transpose(((X+transpose(X,7) ) |(X|X) ) ,4) ) +transpose((shuffle(X) +shuffle(X) ) ,7) ) ,4) +transpose(echo(shuffle(step(step(echo(X,4,6) ,12) ,12) ) ,4,6) ,7) ) ) ) +transpose(shuffle(transpose(((X+transpose(echo(X,4,6) ,4) ) +transpose((X+transpose(X,12) ) ,7) ) ,4) ) ,4) ) +transpose(((((echo((((shuffle(echo(X,4,6) ) +step(echo(((X+transpose(X,4) ) +transpose(X,7) ) ,4,6) ,12) ) +transpose(echo(transpose(echo((X+transpose(X,12) ) ,4,6) ,-5) ,4,6) ,4) ) +transpose(arpeggio(shuffle(step((X|X) ,12) ) ) ,7) ) ,4,6) +transpose(transpose(shuffle((echo((arpeggio(X) |transpose(X,-5) ) ,4,6) +shuffle(step(echo(X,4,6) ,12) ) ) ) ,4) ,7) ) +transpose(((((transpose((X+transpose(transpose(X,4) ,12) ) ,-5) +transpose((((X+transpose(X,4) ) +transpose(X,7) ) +transpose(transpose(((X|X) +transpose(step(X,12) ,12) ) ,-7) ,7) ) ,12) ) +(shuffle((X+transpose(X,12) ) ) +X) ) +transpose((transpose(echo(((X+transpose(X,12) ) +transpose(X,7) ) ,4,6) ,-7) +transpose(((X+transpose(X,12) ) +transpose(transpose(shuffle(echo(X,4,6) ) ,-7) ,12) ) ,7) ) ,4) ) +transpose(transpose((transpose(arpeggio(X) ,-7) +transpose(echo((step(X,12) +transpose(transpose(X,-7) ,12) ) ,4,6) ,12) ) ,-5) ,7) ) ,-7) ) +transpose(shuffle((step(((((echo(X,4,6) +transpose(arpeggio(X) ,7) ) +transpose(X,4) ) +transpose(transpose(transpose(X,4) ,4) ,7) ) |((transpose(X,4) +transpose((transpose((X|X) ,4) +transpose(X,7) ) ,4) ) +transpose((transpose(step(X,12) ,-5) |(echo(X,4,6) +step(X,12) ) ) ,7) ) ) ,12) +(((arpeggio((((((X+transpose(X,4) ) +transpose(X,7) ) +transpose((X+X) ,7) ) +transpose(((X+transpose(X,12) ) +transpose(((X+transpose(transpose(X,-7) ,4) ) +transpose((X+X) ,7) ) ,12) ) ,4) ) +transpose((((X+transpose(X,4) ) +transpose(X,7) ) +transpose(X,-7) ) ,7) ) ) +transpose(step(((X+transpose(X,12) ) |transpose(X,-5) ) ,12) ,12) ) +transpose(echo((transpose(transpose(X,-5) ,4) +((X+transpose(X,12) ) |((X+transpose(X,4) ) +transpose(X,7) ) ) ) ,4,6) ,4) ) +transpose(shuffle(step(transpose(X,4) ,12) ) ,7) ) ) ) ,4) ) +transpose(echo(transpose(transpose(echo((((X+X) |echo(X,4,6) ) +(transpose(X,-5) +transpose(transpose(echo(X,4,6) ,-5) ,7) ) ) ,4,6) ,-5) ,4) ,4,6) ,7) ) ,7) ) +transpose(((arpeggio(transpose(transpose(transpose(((X+X) +(X+transpose((X+X) ,12) ) ) ,-7) ,4) ,-7) ) +transpose((transpose((shuffle(X) +((arpeggio(X) +transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,4) ) +transpose(X,7) ) ) ,4) +transpose((transpose(transpose(X,-5) ,4) +(X+(X+X) ) ) ,-7) ) ,4) ) +transpose(transpose(echo(((arpeggio(transpose(X,-7) ) +transpose(((((X+transpose(X,4) ) +transpose(X,7) ) +transpose(transpose(X,-5) ,4) ) +transpose(X,7) ) ,4) ) +transpose((transpose(X,4) +step(X,12) ) ,7) ) ,4,6) ,-7) ,4) ) ,4) ) +transpose((arpeggio(transpose(step((((((shuffle(X) |((X+transpose(X,12) ) +transpose(X,7) ) ) +shuffle(transpose(X,-7) ) ) +transpose((((transpose(X,-7) +transpose(X,7) ) +((X+transpose(X,7) ) +arpeggio(X) ) ) +transpose((step(transpose(X,4) ,12) +transpose(X,-5) ) ,12) ) ,4) ) +transpose((shuffle(((X+transpose(X,7) ) +transpose(X,12) ) ) +((X|X) +transpose((X|X) ,12) ) ) ,7) ) |shuffle(transpose((((X+transpose(X,4) ) +transpose(X,7) ) +shuffle(X) ) ,4) ) ) ,12) ,-7) ) +(((step((transpose(arpeggio(X) ,-7) |transpose((transpose(X,-5) +transpose(transpose(X,4) ,7) ) ,4) ) ,12) +transpose(transpose((transpose(X,-7) +transpose((X|X) ,12) ) ,4) ,4) ) +transpose((transpose(((X+transpose(transpose(X,-5) ,12) ) +step(X,12) ) ,4) +transpose((transpose(transpose(step(transpose(X,-5) ,12) ,4) ,-7) +shuffle(X) ) ,7) ) ,7) ) +step(transpose(((transpose(X,-7) +(X|X) ) +transpose(transpose(X,-5) ,-5) ) ,-5) ,12) ) ) ,7) ) +transpose(((transpose(((transpose(step(transpose(X,4) ,12) ,-5) +transpose((((step(arpeggio(X) ,12) +transpose((step((step(transpose(X,-5) ,12) |X) ,12) +transpose(arpeggio(arpeggio(transpose(X,-5) ) ) ,12) ) ,4) ) +transpose(transpose((X|X) ,4) ,7) ) |step(((transpose(transpose(X,-5) ,4) +transpose(transpose((step(X,12) +((transpose(X,4) +transpose(X,4) ) +transpose(X,7) ) ) ,-5) ,4) ) +transpose((transpose((echo(X,4,6) +(X+transpose(X,7) ) ) ,-5) |transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,4) ) ,7) ) ,12) ) ,4) ) +transpose(transpose(shuffle((transpose((X+transpose(X,12) ) ,-5) |((echo(X,4,6) +transpose(X,4) ) +transpose(transpose(X,-5) ,7) ) ) ) ,-5) ,7) ) ,4) +transpose(transpose(transpose((shuffle(transpose((X+transpose(echo(X,4,6) ,7) ) ,-7) ) +(step(echo(X,4,6) ,12) +transpose(shuffle(transpose(transpose(X,-7) ,4) ) ,12) ) ) ,-5) ,-5) ,12) ) +transpose(echo(((((arpeggio(((transpose(X,-5) +transpose(((X+transpose(X,4) ) +transpose(step(X,12) ,7) ) ,4) ) +transpose(((X+transpose(step(X,12) ,4) ) +transpose(X,7) ) ,7) ) ) +transpose(transpose(arpeggio((X+step(X,12) ) ) ,-5) ,7) ) |(transpose(transpose(X,-5) ,4) +transpose((transpose(shuffle(X) ,4) +((shuffle(X) +transpose(X,4) ) +transpose(arpeggio(X) ,7) ) ) ,7) ) ) +transpose(step(transpose(arpeggio(step(transpose(X,4) ,12) ) ,-7) ,12) ,12) ) +transpose(echo(step(transpose(((transpose(X,-7) +((X+transpose(X,4) ) +transpose(X,7) ) ) |X) ,-5) ,12) ,4,6) ,7) ) ,4,6) ,12) ) ,4) ) ) ) ,-7) +transpose(((arpeggio(echo(transpose(step(transpose(transpose((X+transpose(X,7) ) ,-7) ,4) ,12) ,4) ,4,6) ) |transpose((shuffle(((arpeggio(arpeggio(transpose(shuffle((X|X) ) ,-5) ) ) +transpose(((transpose(X,4) +transpose(step((X+transpose(X,7) ) ,12) ,7) ) |arpeggio(echo(transpose(X,4) ,4,6) ) ) ,7) ) +transpose(transpose(transpose(transpose(transpose((X|X) ,4) ,-7) ,-7) ,-7) ,12) ) ) +transpose(arpeggio(transpose(((step((step(((X+transpose(transpose(X,-7) ,4) ) +transpose(X,7) ) ,12) +(((X|X) |arpeggio(X) ) +transpose(transpose((X+(X+transpose(X,12) ) ) ,-5) ,12) ) ) ,12) +transpose(arpeggio(transpose((shuffle((X+X) ) +(((X+X) +transpose((X|transpose(X,4) ) ,4) ) +transpose((shuffle(X) +transpose(X,12) ) ,7) ) ) ,-7) ) ,4) ) +transpose(transpose(echo((arpeggio((X+transpose(X,7) ) ) +(X+transpose(X,12) ) ) ,4,6) ,4) ,7) ) ,-7) ) ,7) ) ,4) ) +transpose(transpose((transpose((echo(((shuffle(transpose(((X+transpose(X,12) ) |(X+transpose(X,12) ) ) ,4) ) +transpose(arpeggio((shuffle(transpose(step(transpose(X,-7) ,12) ,-7) ) +transpose(((X+echo(((X+transpose(X,4) ) +transpose(X,7) ) ,4,6) ) +((X+transpose(transpose(X,4) ,4) ) +transpose(transpose(X,-7) ,7) ) ) ,12) ) ) ,4) ) +transpose(transpose(shuffle(((((transpose(X,4) +transpose((step(X,12) +transpose((X+transpose(X,7) ) ,7) ) ,4) ) +transpose(((X+transpose((X+transpose(X,12) ) ,4) ) +transpose(X,7) ) ,7) ) +transpose((transpose(X,4) +transpose((X|X) ,12) ) ,-5) ) |transpose(X,-5) ) ) ,-5) ,7) ) ,4,6) |((shuffle(arpeggio(transpose((step(echo(X,4,6) ,12) +transpose(transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,-5) ,7) ) ,-7) ) ) +transpose(((((transpose(shuffle(transpose(transpose(X,-7) ,-7) ) ,-7) +transpose(transpose(X,-5) ,7) ) +transpose(((arpeggio(X) +transpose((transpose(X,4) +transpose(arpeggio(step((X|X) ,12) ) ,12) ) ,4) ) +transpose(((shuffle(X) +transpose(step(transpose(X,-5) ,12) ,4) ) +transpose((X+X) ,7) ) ,7) ) ,4) ) +transpose(transpose(((arpeggio(transpose(X,4) ) +transpose(((X+transpose(X,7) ) +transpose(X,12) ) ,-7) ) +transpose(((X|X) +transpose(X,7) ) ,-5) ) ,4) ,7) ) |transpose((step(step(arpeggio(transpose(X,-5) ) ,12) ,12) +transpose(((X+transpose((transpose(X,4) +transpose(transpose(X,-5) ,12) ) ,4) ) +transpose((X|X) ,7) ) ,12) ) ,-5) ) ,4) ) +transpose((transpose(echo(transpose(transpose(transpose(X,-5) ,4) ,-5) ,4,6) ,4) +transpose(((transpose(transpose(X,-7) ,4) |(transpose(transpose(shuffle(X) ,-5) ,-5) |step(X,12) ) ) |(((step((X+X) ,12) +transpose((X+X) ,7) ) +transpose(transpose(X,-5) ,12) ) |(((X+transpose(X,7) ) +transpose((X+X) ,7) ) +transpose(X,12) ) ) ) ,7) ) ,7) ) ) ,-5) +transpose(((transpose(shuffle(((echo(((((transpose(X,4) +transpose(echo(X,4,6) ,4) ) +transpose((echo(X,4,6) +(X|X) ) ,7) ) +transpose(echo((X+X) ,4,6) ,4) ) +transpose(step((step(X,12) +transpose(X,-5) ) ,12) ,7) ) ,4,6) +transpose(((arpeggio(transpose(transpose(transpose(X,-5) ,-5) ,-5) ) +transpose(transpose(X,-5) ,4) ) +transpose(((((X+X) +transpose(X,4) ) +transpose((transpose(echo(X,4,6) ,-7) |echo(X,4,6) ) ,4) ) +transpose(X,7) ) ,7) ) ,4) ) +transpose((step(((X+X) |transpose(X,-5) ) ,12) |step(((X+transpose(X,4) ) +transpose(X,7) ) ,12) ) ,7) ) ) ,-5) +transpose((((transpose((((shuffle(X) |(transpose(X,-5) +transpose(X,7) ) ) +transpose(((X+transpose(((X+transpose(X,7) ) +transpose(echo(X,4,6) ,7) ) ,4) ) +transpose(transpose((X|X) ,4) ,7) ) ,4) ) +transpose(transpose((X|X) ,4) ,7) ) ,4) +transpose((arpeggio((arpeggio(((X+transpose(X,4) ) +transpose(X,7) ) ) |shuffle(X) ) ) |step(transpose(transpose(X,4) ,4) ,12) ) ,4) ) +transpose(echo(step(X,12) ,4,6) ,7) ) +transpose(step((transpose((X+X) ,-7) +transpose(transpose(transpose(X,-5) ,-5) ,12) ) ,12) ,7) ) ,7) ) +transpose(echo((step(((arpeggio((transpose(transpose(X,-7) ,-5) |step(X,12) ) ) |((X|X) +shuffle((transpose(transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,-5) ,-5) +transpose((X+arpeggio(X) ) ,12) ) ) ) ) +transpose((((X+(X|transpose(X,-5) ) ) +transpose(arpeggio(X) ,-5) ) |(transpose(transpose((X+transpose((((X+transpose(X,7) ) +transpose(step(X,12) ,4) ) +transpose((X+X) ,7) ) ,7) ) ,-5) ,4) +transpose(transpose((X|X) ,-5) ,12) ) ) ,7) ) ,12) +transpose(transpose(((((((X+((X+transpose(X,4) ) +transpose(X,7) ) ) +transpose(X,-7) ) +step(X,12) ) +transpose(transpose(((arpeggio(X) +transpose(transpose(X,-5) ,4) ) +transpose(X,7) ) ,-5) ,12) ) +transpose((((((((X+transpose(X,4) ) +transpose(X,7) ) +transpose((transpose(X,-5) |transpose(X,-5) ) ,7) ) +transpose((X+transpose(X,7) ) ,4) ) +transpose(((echo(((X+transpose(X,4) ) +transpose(X,7) ) ,4,6) +transpose(transpose(X,4) ,4) ) +transpose(X,7) ) ,7) ) +transpose(shuffle(X) ,-5) ) +transpose(transpose(X,4) ,12) ) ,4) ) +transpose((transpose(echo(X,4,6) ,4) |((((transpose(X,-5) |(X+transpose(X,12) ) ) +transpose((X+X) ,4) ) +transpose((transpose(X,4) +transpose(transpose(X,-5) ,12) ) ,7) ) |transpose((X+transpose(X,7) ) ,4) ) ) ,7) ) ,4) ,12) ) ,4,6) ,-5) ) ,7) ) ,-7) ,7) ) ,4) ) +transpose(transpose((arpeggio(step(step(((transpose(transpose(transpose(((((((X+transpose(X,4) ) +transpose(X,7) ) +transpose(X,7) ) +transpose((X+transpose(X,7) ) ,7) ) |echo(transpose(X,-7) ,4,6) ) |transpose((transpose(transpose(X,-7) ,4) +transpose((echo(((X+transpose(X,4) ) +transpose(X,7) ) ,4,6) +echo((transpose(X,-7) |X) ,4,6) ) ,12) ) ,-7) ) ,-7) ,4) ,4) +transpose((((shuffle((shuffle((((X+X) +transpose(shuffle(X) ,7) ) +transpose(step(X,12) ,12) ) ) +transpose(transpose(((step(X,12) +transpose(transpose((X+transpose(X,12) ) ,-7) ,7) ) +(((X|X) +transpose(X,4) ) +transpose(X,7) ) ) ,4) ,12) ) ) +transpose((echo(transpose(((X+transpose(X,12) ) +transpose((X|X) ,7) ) ,-7) ,4,6) +shuffle(transpose(transpose((X+echo(X,4,6) ) ,-5) ,4) ) ) ,12) ) +transpose((transpose(step(((transpose(X,4) |transpose(X,-5) ) |X) ,12) ,-5) +transpose(((step(X,12) +transpose((echo(X,4,6) |X) ,7) ) |arpeggio(X) ) ,12) ) ,12) ) +echo(step((transpose(((X+transpose(X,7) ) +transpose(X,12) ) ,-5) |(((X|X) +transpose(transpose((X+transpose(X,12) ) ,-5) ,4) ) +transpose(transpose(transpose(transpose(X,-5) ,-5) ,-7) ,7) ) ) ,12) ,4,6) ) ,4) ) +transpose(((((transpose(transpose(arpeggio(arpeggio(transpose(X,4) ) ) ,-5) ,4) +transpose((((X|X) +echo(X,4,6) ) +transpose((X|X) ,7) ) ,-5) ) +transpose(((transpose(((arpeggio(transpose(X,-5) ) +(X+X) ) |echo(shuffle(X) ,4,6) ) ,-7) +transpose(step(((X+X) +X) ,12) ,7) ) +arpeggio(((((echo(X,4,6) +transpose((X+transpose(X,7) ) ,12) ) |X) +transpose(transpose(((((X+transpose(X,12) ) +transpose(X,4) ) +transpose((X|X) ,7) ) +transpose(X,-7) ) ,4) ,4) ) +transpose(transpose(transpose((X+X) ,-5) ,-5) ,7) ) ) ) ,7) ) +transpose(transpose((((echo(X,4,6) +transpose(X,12) ) +transpose(arpeggio(X) ,4) ) +(transpose(X,-7) +(X+transpose(X,-7) ) ) ) ,-5) ,4) ) +(transpose(step(((((step(X,12) +(transpose(X,4) +(X+transpose(X,12) ) ) ) +transpose((X+transpose(X,12) ) ,12) ) +transpose(shuffle(transpose(arpeggio(X) ,-5) ) ,4) ) +transpose(transpose(echo(X,4,6) ,-5) ,7) ) ,12) ,-7) +arpeggio((arpeggio((shuffle((X+X) ) +transpose(echo(transpose(transpose(transpose(X,-5) ,4) ,-7) ,4,6) ,12) ) ) +transpose(((transpose(transpose((transpose(X,-5) +X) ,-5) ,4) +transpose(transpose(echo(transpose(transpose(X,-7) ,-5) ,4,6) ,-7) ,4) ) +transpose(echo(X,4,6) ,7) ) ,-7) ) ) ) ) ,7) ) ,12) ,12) ) +echo((transpose((transpose(transpose(transpose(((((X+X) +transpose(((X+X) +transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,7) ) ,7) ) +transpose(transpose(transpose((X|X) ,-7) ,-7) ,4) ) +transpose(transpose(((transpose(X,4) +transpose(transpose(transpose(X,-7) ,-5) ,4) ) +transpose(transpose(X,-5) ,7) ) ,-7) ,7) ) ,-7) ,-5) ,-5) +transpose((arpeggio(transpose(((transpose(((X+X) +transpose((X+X) ,-7) ) ,4) +transpose((transpose(echo(transpose(X,-5) ,4,6) ,4) +transpose(arpeggio((step(transpose(X,-5) ,12) |X) ) ,12) ) ,4) ) +transpose(transpose((transpose(X,4) |((X+transpose(X,12) ) |(X+X) ) ) ,-7) ,7) ) ,-7) ) +transpose((((transpose(X,-5) +transpose(X,4) ) +transpose(transpose(X,4) ,7) ) +transpose((X|X) ,12) ) ,-7) ) ,12) ) ,4) |transpose((((((((((transpose(X,-7) +transpose(echo(X,4,6) ,4) ) +transpose(X,7) ) +(X+transpose(X,12) ) ) +transpose(step((X+transpose(X,12) ) ,12) ,4) ) +transpose(transpose(((X+transpose(((X+X) +transpose(X,-5) ) ,7) ) |arpeggio((transpose(X,-7) +transpose(X,-5) ) ) ) ,4) ,7) ) +arpeggio((((((X+transpose(transpose(X,-5) ,7) ) +transpose(shuffle(transpose(X,-5) ) ,4) ) +transpose(X,7) ) +transpose((transpose(transpose(X,-5) ,4) |X) ,4) ) +transpose((step(X,12) +((X+transpose(transpose(X,-5) ,4) ) +transpose(X,7) ) ) ,7) ) ) ) +transpose((transpose(step(echo(transpose(X,-5) ,4,6) ,12) ,4) |step(arpeggio(transpose(transpose(X,-5) ,-5) ) ,12) ) ,4) ) +transpose(transpose(transpose((echo(arpeggio(X) ,4,6) +transpose(((X|X) +transpose((X+X) ,12) ) ,4) ) ,4) ,4) ,7) ) +transpose(transpose(transpose(transpose(transpose(transpose((shuffle(X) |(X|X) ) ,-7) ,-5) ,4) ,-7) ,4) ,7) ) ,-5) ) ,4,6) ) ,-7) ,7) )
random seed used was 153885499

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