Apparatus and methods for deterministically classifying and indexing objects that are perceived arbitrarily and subjectively, such as digital media and file representations of photographs, in a database. A user establishes various personalized descriptive category sets to organize media, such as digital photographs, video, and audio. The descriptive category sets include categories to describe some aspect or attribute of the objects of the user. Each category may be arbitrarily definable and contain a finite number of descriptors, constituting values within the category. Objects are entered into collections by filtering the objects according to the descriptors of the descriptive category set. A user may thus arbitrarily define a schema of classification according to perceptions, links, experiences, and the like, according to the subjective memory, vocabulary, and mental connections of a user.