The ontological model of the physical world of the Timaeus is based on a complex nonmaterial stereometry
It contains planimetry, arithmetics, geometry and stereometry
These are theory number, geometry, stereometry
, harmonics and, finally, dialectic.
Polarity is therefore only a part of the problem, and so far as it draws attention away from the whole problem it seems best to substitute the term stereometry
The chair, too, is one of the artist's most recognizable and recurring forms, and it is often the focus of his manipulations of empty and full, silhouette and stereometry