Facet, Appearance, Surface

A proponent of a Causal theory of Perception, such as Schopenhauer, could argue against the previously proposed distinction between Facet and Appearance, on the grounds that a Facet is the resultant of the causal interaction between percipient and perceived, and, hence, is not independent of being perceived, i. e. is an Appearance.  However, insofar as a Facet is a section of a Surface, that argument is more to difficult to make.  For, is only rare cases when the object of perception is an entire surface, e. g. when a hand totally encompasses some small item.  Hence, a Surface cannot, in general, be reduced to an Appearance, and, likewise for any of its sections.