At its most tangible, a body can be a seemingly well-defined organ like a liver. Or it can be a spatially challenging network of solid and liquid like the vascular system. Or it can bean invisible assembly, truly as an abstract a thing as "traffic" or "democracy", like the immune system, with its lymphocytes and T4 messengers, a miniaturized cryptography machine for encoding and decoding data about invading organisms_Chaos by James Gleik, P280

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