systems brentano 's concept intentionality would become widely influential including analytic philosophy heidegger author ''being time'' saw focusing qua introducing novel concept ''dasein'' process classing existentialist sartre wrote extensive study ''being nothingness'' speculative realism movement marks return full blooded realism process metaphysics two fundamental aspects everyday experience change persistence recently western philosophical tradition arguably championed substance persistence notable exceptions however according process thinkers novelty flux accident matter sometimes
Humanities Philosophy Metaphysics