After 1955, Heisenberg professed a modified form of Kantian philosophy whose starting point was the existence of universal and necessary scientific laws. Those universal and necessary scientific laws from which Kant started have been shown to belong only to restricted domains of intuitive experience (the domain of everyday life and classical physics). Heisenberg defines noumenal reality as the object of an intellectual intuition (episteme) which, however, is a kind of knowledge we do not possess. We know noumenal reality only through symbols in an intellectually patterned experience. There are two kinds of noumenal reality : there is the thing-in-itself which is the correlate of the phenomenal object, and there is the dunamis (or Aristotelian potentia or objective tendency) which is the correlate of the quantum mechanical system (e.g., elementary particle, atom, etc.). The latter is the noumenal correlate of the phenomenal or experienced union of subject and object taking place in the act of observation. The importance of universal symmetries in the expression of general laws of nature is stressed by Heisenberg, and these constitute for him the true basis for transcendental philosophy.
After 1955, Heisenberg professed a modified form of Kantian philosophy whose starting point was the existence of universal and necessary scientific laws. Those universal and necessary scientific laws from which Kant started have been shown to belong only to restricted domains of intuitive experience (the domain of everyday life and classical physics). Heisenberg defines noumenal reality as the object of an intellectual intuition (episteme) which, however, is a kind of knowledge we do not possess. We know noumenal reality only through symbols in an intellectually patterned experience. There are two kinds of noumenal reality : there is the thing-in-itself which is the correlate of the phenomenal object, and there is the dunamis (or Aristotelian potentia or objective tendency) which is the correlate of the quantum mechanical system (e.g., elementary particle, atom, etc.). The latter is the noumenal correlate of the phenomenal or experienced union of subject and object taking place in the act of observation. The importance of universal symmetries in the expression of general laws of nature is stressed by Heisenberg, and these constitute for him the true basis for transcendental philosophy.