The name ‘Skulpturenmuseum Glaskasten’ describes, on the one hand, the location – the fully glass-enclosed space of the museum beneath the meeting wing of the Rathaus in Marl – and on the other hand, the substantive concept of openness and transparency for everyone. In Marl, the works of art are not hidden behind museum walls; instead, many of them are integrated into the everyday life of the city. More than 100 outdoor works, from Arp to Zadkine, are positioned in the public space that surrounds the town hall and the artificial city lake. The closer one comes to the actual Glaskasten, the denser the ring of sculptures becomes. The glass-encased interior spaces of the museum, which can be viewed at all times, house large sculptures that are not suitable for outdoor installation, as well as a series of small sculptures and objects.