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Physical Sources are the rivalrous, material aspects of reality such as space, time, mass and energy required to host (store and express) any design. They are the tangible means of production such as land, water, sunlight, tractor, roto-tillers, drill presses, etc. They are also sometimes
instances of Virtual Sources. For example, the design of an Earth Block Compressor is a Virtual Source, but the land, buildings, tools, steel, plastic, grease, energy, space needed to construct each working copy are the physical sources.
