 Locke is aware that it is not easy to demonstrate that the fundamental identity and unity of a value-mode depends on a feeling-quality. It may be that the position thus far articulated is merely hypothetical and speculative and requires an experimental methodology to prove it. Locke notes that the main objections to the position have been addresses by developments in the Gestalt psychology insofar as it has established an empirical basis for a comprehensive perceptual scheme functioning in recognition, comparison and choice. Further circumstantial evidence is offered for the position by the phenomenon of transvaluation (see  section 2.3  below).