Each expression-medium has a life of its own. Regulated by certain laws, it can be mastered only by intuition during the act of creating. It is in the nature of the laws which govern every expression medium that two separate entities, related through empathy, always produce a higher third of a purely spiritual nature. This spiritual third manifests itself as a quality which carries emotional content. This quality is the opposite of illusion; it is the reality of the spirit.

'Excerpts from the Teaching of Hans Hofmann', p. 61 - Search for the Real and Other Essays (1948)