  The fundamental physical theories that interpret and explain behaviour of
matter in nature are dependent on several unobservables and insensibles in
their construction. While a rigorous natural philosophy cannot take them for
granted, there does not seem to be a way of avoiding such unobservables in our
theories. While a program to banish all unobservables from physical theory is
unlikely to succeed, and perhaps even unnecessary, they are both the strong and
weak points of the theoretical descriptions of physical nature. Analyzing them
for empirical and philosophical consistency and integrity is always a promising
path towards a better theory. In this paper, I examine the nature of physical
reality in the context of unobservables in physics and discuss three examples.
One is about the apparent loss of physical reality due to the need for a
consistent quantum mechanical representation. The second example deals with the
conflict between the assumed reality of quantum fields, so fundamental and
essential to our standard physics worldview, and the dynamics of the observable
universe. The third deals with an all-important difference between conventional
modern physics constructed in the unreal and unobservable empty `space' and an
empirically and logically determined physics with matter-filled universe as its
arena. The acknowledgment of the observable matter-filled universe necessitates
reformulation of dynamics with total relativity. Not surprisingly, this
paradigm with its universal cosmic links also holds human concepts of harmony
and beauty.

History and Philosophy of Physics