Pebbles from the Rhine, moved over hundreds of kilometers, are the basic material of Detlef Kleinen's relief works. Collecting the pebbles is a process of walking along the banks from kilometer stone to kilometer stone. Current finding areas are around Rhine kilometer 450. The raw material is then sorted according to size and cross-section as well as color of the stones. The design is inspired by dry stone walls of the steep slopes in the vineyards and ancient soil mosaics. The rarity of the extremely flat stones limits the number of images. On large reliefs he works months to years.