For years, Martin Walde has been developing an inimitable, innovative, and successful praxis that includes the exhibition visitor in his dynamic process of creating installations. His works have clearly expanded the concept of sculpture, and his way of working with materials has completely altered our notions of material and space: sculpture can also be regarded as behavior in space. His works are no longer fixed in a gallery, but are instead mobile, multifunctional, and free of context as well as naturally interactive. Thus, on very different levels aesthetic, material, and intellectual Walde succeeds in shedding light on various issues associated with the production of art. By making room for coincidence and the viewer s own will, the artist allows them to playfully participate in his energetic work processes.