The heap owes its striking new shape to the Swiss architect Rolf Keller
The heap is crowned at the southeastern part by the light sculpture "Nachtzeichen" created by the artists Klaus Noculak and Hermann EsRichter. Here, two mirrors were installed so that their rays cut in the middle of the pyramid in one point and also pick up the natural slope angle of the heap. The rays thus form an artificial tip of the pyramid.
