The artwork of Fischli/Weiss is an articially produced natural phenomenon. Here, tuff stones from a Bavarian quarry are stacked to a height of five metres and watered with a sophisticated system. Over time, moss should grow on the porous stone and cover the bright surface with a green carpet. The «artificial» moss rock in Zellweger Park holds something alienating, almost unreal, because it pretends to be a part of nature. At the same time, the work has an experimental character, as the slow growth of the moss cannot be predicted exactly.

Peter Fischli and David Weiss worked together from 1979 to 2012 and are among the most important contemporary artists in Switzerland. Their work often seems to have been developed through playful instincts and always includes a humorous side. The theme of artifice is present in many works, as in the well-known polyurethane carvings that pretend to be real objects. Their preoccupation with everyday occurrences often raises further questions, but with irony takes the weight off the philosophical musings.

A fictional landscape in relief: Shrunk by the artists to a size of two and a half by four meters. The concrete cuboid has a thickness of 15cm, rests on two short tree trunks and appears to hover just above the ground. This impression is reinforced by the grasses and flowers that surround the relief swaying in the light wind. Whereas the base of the cuboid is made of smooth concrete, on top the artists have designed a topography which over the years has been taken over by moss and lichen. This terrain is a conglomerate of building material and stones, a type of stone mixture that occurs in the Swiss alpine foothills. Seeds, leaves and other plant parts settle in the small furrows and craters. Small hills and larger mountains rise, water collects in the valleys. The smallest creatures find their habitat here. Microorganisms occupy the microcosm. Nature occupies the artistic territory. We focus on this speck of a landscape as if it were an analogy of our world with its interactions. At first sight a crude, concrete body, it changes during a longer immersion in the landscape, tells stories, reveals details - similarly to how the surface changed, grew and aged over the years.