Saying this is sick and beautiful is about all I could muster when I first saw it. N-joy. (this find is brought to me via Two Cents)
"Graffiti Analysis is an extensive ongoing study in the motion of graffiti. Custom software designed for graffiti writers creates visualizations of the often unseen gestures involved in the creation of a tag. Motion data is recorded, analyzed and archived as Graffiti Markup Language (.gml) files, a specifically formatted XML file designed to be a common open structure for archiving gestural graffiti motion data. GML files are saved in an open online database, 000000book.com, where writers can share analytical representations of their hand styles. Graffiti Analysis is an open source project that is available online for free in OSX, Windows and Linux. Graffiti writers are invited to capture and share their own tags, and computer programmers are invited to create new applications and visualizations of the resulting data." ~ Graffiti Analysis