"Rudolf Kämmer uses a strictly constructive concrete design vocabulary. Since the end of the 1950s, Kämmer has developed his ideas rendering basic geometric forms on graph paper with mathematical precision, while his colours, used sparingly, make his works glow and lift them up to an emotionally experienceable plane of existence. From 21st June, Quittenbaum is going to present canvases, 'Kugelbilder', textured paintings and object paintings from the 1960s until now. So-called 'Spielobjekte' ('Playthings') invite the beholder to take part in the genesis of an artwork. Accentuated elements of wood, gutters, rods, crosses or squares, can be turned and adjusted. The passive art consumer is thus turned into a self-confident player who can help shape the effect of the artwork in line with the vanguard ideas of the 1960s"--Publisher's website.