The endo/exo-dichotomy is discussed with respect to matter, mind, and time. It is argued that the dichotomy itself is based on the principle of observability. A solution of temporal "binding" problems of the brain is suggested which introduces an operational principle. The status of the Now as a transitory element between past and future or as being transient itself is explored. The Now is considered as a window to a dynamics beyond temporal succession. This dynamics is expressed in terms of a complementarity of continuous and discrete time.