- ·Horse skull, study
- ·1973
- ·25 cm
- ·Ink, paper
- ·00.157.2.
- ·Horse skull, study
- ·1974
- ·25 cm
- ·Ink, paper
- ·00.157.3.
- ·Horse skull, study
- ·1974
- ·25 cm
- ·Ink, paper
- ·00.157.4.
- ·Horse skull, study
- ·1974
- ·25 cm
- ·Ink, paper
- ·00.157.5.
- ·Spiral staircase
- ·1973
- ·30 cm
- ·Ink, paper
- ·00.314.8.
- ·Twisted shape
- ·1973
- ·40 cm
- ·Ink, paper
- ·00.264.2.