Deleuze is a key figure in postmodern French philosophy. Considering himself an empiricist and a vitalist, his body of work, which rests upon concepts such as multiplicity, constructivism, post-structuralism, difference and desire, stands at a substantial remove from the main traditions of 20th century Continental thought. His thought locates him as an influential figure in present-day considerations of society, creativity and subjectivity. Notably, within his metaphysics he favored a Spinozian concept of a plane of immanence with everything a mode of one substance, and thus on the same level of existence.