Written by coream at 3/25/2009 12:20:00 AM Would you like to use your current bike to make your own art? For that you need the Contrail, a tool that attaches to your bike's seat tube and leaves a colorful chalk line behind you as you ride...

The Contrail holds 200 grams of chalk — enough for about 20 miles of riding — all the while leaving a faint line that reminds fellow cyclists where it's safe to ride... As bikers follow, the chalk lines grow brighter reclaiming the crucial shared space...