There was a direct mapping between what was thought to be an architectural vocabulary of: “walls, windows and doors” and simplified computational equivalent. Maybe this was all that could be implemented at the time. But the net result, and disastrous at that, was to entrench this highly limited form of architecture by making it “more efficient” and excluding to architecture based on more general geometry or less conventional components and configurations. What is different with recent parametric design tools is that the sets of constructs is far more abstract, but at the same time the system is “extensible”, so that it is the designer who can make his own vocabulary of components. We have broken the “hard-coded” native architectural semantics. We are no longer interested in ”local efficiency” within a restrictive CAD system, but rather the designer has the opportunity to define his own vocabulary from first principles, by first understanding the underlying geometric and algebraic abstractions.