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I often remind people of the word "orrery". An orrery is a model that works perfectly well, its use results in highly accurate predictions… within bounds of application. The difference between an orrery and a theory, is that a orrery is not causally supported by foundational understandings of the universe. An orrery is internally consistent, but externally disassociated. The classic orrery of course is the painted balls on bent wires articulating around a set of gears and cams on spindles that classical scholars produced to explain the motion the sun and moon and other celestial bodies. Obviously, such models predict the behavior of the system, but don't come near explaining the causal hierarchy that leads to behavior. planets and stars aren't hooked to huge rods. It is theoretically possible to concoct an infinite number of orreries, causally false models, to explain and model any one system or domain. Randall Lee Reetz