ABSTRACT
This chapter examines the nature of physical reality in the context of unavoidable unobservables in physics. One of the features of science, especially physical science, is a powerful urge to construct theories of phenomena, instead of just cataloging and classifying phenomena and their spatio-temporal patterns. The concept of fields' of various kinds dominates physical theory and modern physics, and fields are essential to both classical and quantum theories. The concept of physical reality in the context of the Einstein, Podolsky and Rosen (EPR) assertion of the incompleteness of quantum mechanics is perhaps appropriate. Quantum theory of physical systems consisting of large number of particles led to the concept of a quantum field associated with the particles, a generalisation of the wave function itself. Space and time are supreme and primary unobservables in physics, without any reality independent of matter, notwithstanding their modern status as the dynamical arena of gravitational effects as described in Einstein's general theory of relativity.
