Brooklyn-based Studio Gelardi came up with something arty for cyclists to make the streets more colourful. They designed Contrail, a small apparatus that sends a coloured message to the mobile community. Contrail attaches to any bike’s seat tube and applies a thin layer of chalk powder in one of several colors to the rear tire. The result is a streak that visually enhances public space.
—Source: Cool Hunting
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[...] we wrote about Contrail. This project even goes beyond that! Some guys have invented an amazing city printer called the [...]