Class-ification is part of a series of tree bark figures that are meant to represent some of the characteristics shared by trees and humans. Class-ification references Nefertiti, the royal wife of an Egyptian pharaoh, through the figure's headdress. This is intended to convey the idea of social class and the groups within those classes. People can be further separated, or can separate themselves, into groups by gender, race, wealth, beauty, religion and sexual orientation, to mention only a few. Pieces of tree bark from a variety of both coniferous and deciduous trees create the lower half of the figure, as a representation of how trees are similarly ranked, grouped and classified biologically by family, genus and species.