The move from a particle description to a field description will be especially fruitful if the fields obey simple equations, so that we can calculate the future values of fields from the values they have now...Maxwell's theory of electromagnetism, general relativity, and QCD {quantum chromodynamics} all have this property. Evidently, Nature has taken the opportunity to keep things relatively simple by using fields.
( Rodney A. Brooks )
[ Fields of Color: The theory ]
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