"A work of art rests its merits in traditional qualities. It may constitute a remarkable feat in craftsmanship; it may be a searching study of psychological states; it may be a nostalgic glance backward; it may be any one of an infinite number of concepts, none of which may have any possible bearing upon its degree of newness."

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Both matter and radiation possess a remarkable duality of character, as they sometimes exhibit the properties of waves, at other times those of particles. Now it is obvious that a thing cannot be a form of wave motion and composed of particles at the same time - the two concepts are too different

— Werner Heisenberg