Click mouse and drag in direction you want the fringed line to form.
Or, you can click on the Auto button to start random lines.
Works great in Turbo mode of the Flash player.
Very much inspired by the awesome iPad app "Substrate"
Pressing the B key will cycle you to the next background.
I had a problem with some versions of the Flash player having issues with the Touching Edge block so this version uses hard limits on X and Y for edge testing.
There still seems to be a bug when the line is shot across with the fringe facing up...it's ending prematurely.