Jigsaw-puzzle-like 3D diagrams to represent syntactical constraints

Three-dimensional diagrams composed of jigsaw-puzzle-like glyphs are proposed for representing syntactical constraints. The 3D glyphs have convex and concave shapes that give visual representation to the constraints. A production rule of grammar is represented by a stretchable board shape. A syntactical structure is represented by a nested board shape; and a syntactical constraint is represented by an inclusive match between the convex shape of one board and the concave shape of another. A generation method of jigsaw-puzzle-like 3D glyphs for context-free grammar is proposed and described.