"...what is essential is invisible to the eye."  'The Little Prince', Antoine de Saint-Exupery  

Physics deals with the observable world and its laws whereas Metaphysics (‘after physics’) deals with the unobservable world and attempts to explain the fundamental nature of being.

Typical questions that confront the metaphysician are:
 • What are Space & Time?
 • What is a Thing & how does it differ from an idea?
 • Are human free to decide their fate?
 • Is there a 1st cause, or God, that has made everything?

The metaphysician knows that answers to the above cannot be arrived by observation or experiment (the Scientific Method).  In the Asian mindset, metaphysical answers are put into a religions framework, whereas in the Western mindset, answers are speculation.

A central branch of metaphysics is ontology, the investigation into the basic categories of being and how they relate to each other.

Prior to modern science, scientific questions were addressed as a part of metaphysics known as natural philosophy. The term science itself meant "knowledge of”. The scientific method transformed natural philosophy into an empirical activity deriving from experiment unlike the rest of philosophy. By the end of the 18th century, it had begun to be called "science" to distinguish it from philosophy. Thereafter, metaphysics denoted philosophical enquiry of a non-empirical character into the nature of existence.