Doobybrain.com | Contrail bicycle chalk drawing conceptContrail is a concept bicycle device that attaches above the wheel of a bike and covers the bicycle wheel with a layer of chalk. The chalk then creates a trail or mark on the surface of the road, turning the bike into a sort of large drawing utensil. The concept, developed by Pepin Gelardi of Studio Gelardi focuses around the idea of safety in numbers. By using this device, bicyclists will have a
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