During last weekend's Anime Central convention in Rosemont, Illinois, illustrator Eric Maruscak created the 9' wide x 12' tall Madoka Magica chalk art mural. The work took 7 hours to sketch, and an additional 22 hours to color live on the show floor, for a total of just under 29 hours from start to finish. Watch the whole process in time lapse below.
Shiftylook Chalk Art Time Lapse from C2E2 2012
The Legend of Zelda: Ocarina of Time 3D Chalk Art Time Lapse
Otakon Chalk Art 2011
NY Comic Con Yu Gi Oh Chalk Art Timelapse