The biotope with the sculpture garden came about at the instigation of the artist Hans Erni. The amenity is a symbiosis of nature and art, economy and ecology. It also alludes to the time when this area – called Brüelmoos – was a boggy, reedy marsh until well into the 20th century. The first biotope was created in 1979 to coincide with the opening of the Hans Erni Museum. It was given a comprehensive rejuvenation in 2011/12, at which point the pond was enlarged, the sculpture garden rearranged and a ceramic mural installed. A terrace was also added beneath the canopy, providing an opportunity for visitors to linger.