Covenant-contract duality
In quantum mechanics, wave–particle duality is the theory that every particle or quantum entity may be described as either a particle or a wave. It captures the indecency of concepts particle or wave to fully capture the nuances of how quantum-scale objects behave. As Einstein said: It seems as though we must use sometimes the one theory and sometimes the other, while at times we may use either. We are faced with a new kind of difficulty. We have two contradictory pictures of reality; separately neither of them fully explains the phenomena of light, but together they do. ...