The field of creativity needs to make room for commonplace inventions:
hand tools, tables, and chairs. When examined on a conceptual basis,
these simple implements reveal a rich set of concepts and principles t
hat provide a first approximation to a language of invention and synth
etic thinking. Such a language has potential application to broader do
mains and to more complex areas of creativity. Any such language must
build on common terms and ideas to produce a systematic approach to th
e familiar. That approach is implemented here in the context of a simp
le invention, the chair and its relatives, with other examples brought
in to illustrate generality. Two different paths of invention are put
forth. First, a conceptual history based on the gradual accretion of
complexity, and second, a modem account based on the principles of eng
ineering design. Each provides a useful framework for a different way
of viewing creativity, yet the central concepts remain the same.