The idea is just as simple as the game: removing parts from the original form to create a new form. The new form may still resemble the original, but it may also look completely different. These are subtractive forms, and can surprisingly be found in many places you look.
|Image credit: Bissell, Therese. "A Not-So-Simple Plan." Architectural Digest. November 2006. 194. (Overlay mine.)|
This can be done in different ways, and more than once, depending on the concept at hand. Modernist houses like the one above have more than one subtractive form to be found. For example, the second floor seems to have a subtractive quality, as does the fireplace downstairs. This maintains a clean-lined aesthetic without it appearing static and uninteresting. Subtractive forms may also serve a purpose, mainly in delineating special spaces. Some resort hotels or vacation homes subtract in order to integrate with what's outside, such as a pool. That space then serves a transitional purpose, allowing users to seamlessly move from indoor to outdoor with no thought or effort.