Paul Watzlawick's most famous axiom is - "One Cannot Not Communicate: Every communi- cation has a content and a relationship aspect such that the latter classifies the former and is therefore a metacommunication." »
Two of his publications I enjoyed most are How real is real, Paul Watzlawick, 1976 and The situation is hopeless, but not serious, Paul Watzlawick, 1983.
How many realities exist - only one? How complex is reality, and how is brain function, perception and consciousness involved on the molecular level? What was originally a mainly philosophic question becomes more and more scientific. It is not any longer only about "Being and Nothingness" (1943) of Jean-Paul Sartre or G. Friedrich Wilhelm Hegel's "Phenomenology of Mind" (1807).