C-Zero - The competition required to reinterpret and combine at least one of the 100 parts that form the mechanics and body of Citroen cars, transforming them into objects of everyday use.C-zero is a tricycle for 0-80 age, realized by using different parts: a rim C4 for the front wheel, a rear headrest C1 for the seat and three hub-caps C4. The tricycle is the first Citroen of the C series.