“The deeper the influence of the formal, decorative element upon the method of representation, the more probable it becomes that formal elements attain an emotional value. An association between these two forms of art is established which leads, on the one hand to the conventionalization of representative design, on the other to the imputation of significance into formal elements. It is quite arbitrary to assume a one-sided development from the representative to the formal or vice versa, or even to speak of a gradual transformation of a representative form into a conventional one, because the artistic presentation itself can proceed only on the basis of the technically developed forms…”
— Franz Boas, “Representative Art,” pps. 82-83 Primitive Art (1927)