Virtually all of them but with special attention to Plato, Kant, and by extension virtually all modern Western philosophy: https://plato.stanford.edu/entries/kant-transcendental-id… > In the first edition (A) of the Critique of Pure Reason, published in 1781, Kant argues for a surprising set of claims about space, time, and objects: > Space and time are merely the forms of our sensible intuition of objects. They are not beings that exist independently of our intuition (things in themselves), nor are they properties of, nor relations among, such beings. > The objects we intuit in space and time are appearances, not objects that exist independently of our intuition (things in themselves). This is also true of the mental states we intuit in introspection; in “inner sense” (introspective awareness of my inner states) I intuit only how I appear to myself, not how I am “in myself”.