"One of the striking novelties of quantum theory is the notion of entanglement.  When two distinct particles enter into a state of quantum entanglement, they lose their individual identities and act as a unified system.  Any change to one of them will immediately be felt by the other, even if they are light-years apart.There is nothing analogous to this in classical physics.  When quantum entanglement occurs, the whole becomes more than the sum of its parts.  This is so radically at odds with our everyday way of viewing the world that Einstein himself pronounced it 'spooky.'"

--Jim Holt, Why Does the World Exist: An Existential Detective Story  (195)

What I kept thinking about after reading this passage is how the "notion of entanglement" could serve as a standard for artistic collaboration--a collaboration, that is, succeeds to the extent that the participants' work becomes entangled.  The more thoroughgoing the entanglement, the more successful the work.