Generating functions.

Generators create steps. Iterators take steps. What creates rails? Parametric functions? Hmm. It would seem like a generator (function) that creates curves and surfaces and volumes and hypervolumes (all are hypershapes). The whole thing in one call. What are lambda functions? What are generators which generate hypermovies and hyperdocuments? JSP used to generate hyperdocuments. Now it seems like JavaScript generates hyperdocuments.