RATIONALE

Ken Brown (1997) "Grammatical Design", IEEE Expert: Intelligent
Systems and Their Applications, 12(2), 27-33.


This paper provides a survey of the use of grammars in generating
designs.  Grammars for programming and natural languages are usually
used for 'parsing' to determine the correctness and structure of an
input. However, running them in "reverse" to generate rather than
analyse is possible if done carefully.  They need to controlled in
order to generate sensible, legal designs.  Grammars can assemble 2D
shapes to make plans, or 3D shapes to make designs.