Selftracking is an ongoing project aiming at analysing an architecture of my mobility in public space. An invisible crack I make while walking on the surface of public realm is recorded due to GPS, processed and visualized to become a pictogram - like symbol -- a letter in an alphabet of public behaviors. Started on August 21, 2010 in Stockholm. At the ArtHack day I played with several of the walks in gps files to eventually print them in 3d technology.