 Thus a very crucial distinction must be made between two levels of phenomenality and of objectivity, which for the purposes of this article shall be called “first-order” and “second-order” (cf. Stolzenberg 1995: 25). A first-order phenomenon is the psychic, subjective appearance that Natorp tacitly acknowledge has a basis in sensibility, and which he calls the “Phänomen letzter Instanz” or the “phenomenon of final authority” (Natorp 1887: 273, 274; 1913b:  192);[29]  this first-order phenomenon is a “Vorstellung”, or “representation”, i.e., a doxic phenomenon (Natorp 1887: 266, 267; esp. 273). Hence it cannot be the referent of knowledge or science, since science does not concern itself with doxic appearances as such, but the objects (or objectivities) which appear in or through the appearances (Natorp 1913b: 193). 