The stories Mari Lesteberg tells won’t put her on the New York Times’ bestseller list, but that doesn’t make them any less fantastic. Watching her simple side-scrolling tale of a little girl venturing into a dark cave isn’t terribly exciting, until you realize the artwork is actually playing the accompanying soundtrack using the tiny piano on the far left.

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Mari uses a software tool called MIDI—short for Musical Instrument Digital Interface—that allows electronic instruments like synthesizers and drum machines to be controlled from a computer. That’s a simplified explanation of the technology, but what you’re seeing here is a visual representation of all the triggers playing the various piano notes, also arranged to form recognizable images, which is incredibly tricky to while still creating a great piece of music.

[YouTube via BoingBoing]