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laws governing the world of elementary particles are based on the principle of symmetry. For example, the strong interactions respect the gauge symmetry SU (3) of color. Gluons carry the interactions between quarks which have a quantum number called color (nothing to do with actual colors!). The Lagrangian that describes these interactions is invariant under base change in the color group. All particles can adopt their own agreement locally. To do this each term of the Lagrangian must have a precise way.

The symmetries are postulated as the ultimate in the way we understand nature. This idea has always like a deep abyss. Symmetry postulate. The universe appears to be governed by principles of invariance can take bases for arbitrary local quantum numbers. This applies to the strong interactions, for the weak and the electromagnetic. In each case the quantum numbers change, and consequently, the symmetry group.

The big mystery remains to find a consistent and satisfactory construction of the quantization of General Relativity. The underlying symmetry group remains unknown, despite the conceptual developments in string theory. The gulf of understanding that laws correspond to symmetries deepens to know unlikely to reach even partial solution for our lives.