  We propose the quantum mechanical description of complex systems should be
performed using two types of causality relation: the ordering relation ($x\prec
y$) and the subset relation ($A\subseteq B$). The structures with two ordering
operations, called the causal sites, have been already proposed in context of
quantum gravity (Christensen and Crane, 2005). We suggest they are also common
to biological physics and may describe how the brain works. In the spirit of
the Penrose ideas we identify the geometry of the space-time with universal
field of consciousness. The latter has its evident counterparts in ancient
Indian philosophy and provides a framework for unification of physical and
mental phenomena.
