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Design paradigms can be used either to describe a design solution, or as an approach to design problem solving. Problem solving occurs through a process of abstraction and characterization of design solutions, with subsequent categorization into problem solving types. The approach is akin to the use of metaphor in language; metaphors are used to help explain concepts that are new or unfamiliar, and to bridge between a problem we understand and a problem we don't. Design paradigms then can be seen as higher order metaphors; as the often three-dimensional distillation of a working relationship between parts, between groups of things, between the known and the unknown. In this sense, a bridge is a paradigm of the connection between the known and the unknown, and the functional equivalent of a physical bridge is consequently used in many fields from computer hardware to musical composition.