Seesaw
Subtitle: dieses Buch ist ein Schaukel = this book is a seesaw
By: Hans Knuchel, Jürg Nänni ; [translation, Catherine Schelbert].
Contributors: Nänni, Jürg.
Edition: 2. Aufl.
Publisher: Verlag Lars Müller; Lars Muller Publishers
Published: 1994
Place of publication: [Baden?]
Language: ger
Subjects: Optical illusions; Visual perception
Other titles: Seesaw: this book is a seesaw.
Notes: In German and English.
Metallic semicircle in pocket.