Simple fold - a fold which flattens to form a single crease or makes use of a single crease that has been established earlier in the folding sequence. See complex fold. Squarism - a slightly derogative word sometimes used to describe the belief that folding squares is somehow 'purer' than folding other rectangles. Stellation - in mathematics a stellation is a form produced by extending the sides of a convex polyhedron until they intersect. In origami this term is often misused to mean any star-like form produced by adding pyramids to the faces of a convex polyhedron.
Damp paper folds like cloth.
Folds set into damp paper become permanent once the paper dries.