Sze's work is influenced, in part, by her admiration for Cubists, Russian Constructivists, and Futurists. This view is again associated with some social constructivists (e.g., feminist epistemologists). The difference between traditionalists and constructivists was not well defined. Although Vygotsky predated social constructivists, he is commonly classified as one. However, some finitist philosophers of mathematics and constructivists object to the notion. Understanding and acting are seen by radical constructivists not as dualistic processes, but "circularly conjoined". Matulka introduced Smith to the work of Picasso, Mondrian, Kandinsky, and the Russian Constructivists. Educational constructivists hold that learners actively construct knowledge. REBT clearly acknowledges that people, in addition to disturbing themselves, also are innately constructivists. Some constructivists accept the existence of only those reals that are computable. On the other hand, there are radical constructivists who take discourse and linguistics more seriously. The Constructivists were early developers of the techniques of photomontage. In particular, constructivists hold that learners actively construct knowledge. The design goes back to ideas of the Russian constructivists from the 1920s. The exhibition structure also housed works by several of the other British constructivists.