Fredenberg 'O' 1990,
Travertine with copper sulphate
230 x 250 x 3 cm
Private Collection, Zürich
Freudenberg Bars, 1990,
Travertine with iron oxide
230 x 255 x 3cm
Private Collection, Zürich
Freudenberg Circle, 1990,
Travertine with ciment fondu and oxides
Private Collection, Zürich
Freundenberg Square, 1990
Travertine with ciment fondu and oxides
230 x 800 x 3 cm
Private Collection, Zürich