Geometrodynamics
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Geometrodynamics is a now abandoned domain of theoretical physics. Important during the 1960s, its aim was to provide theoretical basis for an ontological reduction of all of physical phenomena - such as gravitation, electromagnetism and later even quantum mechanics - to the geometrical properties of a (curved) space-time. As such, it is a prolongation of Albert Einstein's project of a unified field theory.
Aiming at a systematic identification of matter with space, geometrodynamics has often been said to be an extension of the philosophy of nature as conceived by Descartes and Spinoza. The geometrodynamics program, however, failed to explain some important physical phenomena, such as the existence of fermions or that of gravitational singularities.
John Archibald Wheeler, the initiator of the program, abandoned it in the early 1970s.