The vision of Clifford and Einstein can be summarized in a single phrase:
A Geometrodynamical UniverseA world whose properties are described by geometry, and a geometry
There is nothing in the world except curved empty space. Matter, charge,
electromagnetism and other fields are only manifestations of the bending
Physics is geometry.
If we imagine the gravitational field to be removed, there does not
remain a space, but absolutely nothing.
There is no such thing as an empty space, i.e. a space without field.
Space-time does not claim existence on its own, but only as a
structural quality of the field.