Last week I posted about Wilhelm Wundt, and said that he was a structuralist, as distinct from a functionalist, in psychology. What does this mean? It means that his goal was to break down consciousness into elements, and then to suggest how the elements combine, or could have combined, to create the whole structure that we know through introspection. For Wundt the structure begins with sensation. At first blush a sensation is a physical fact -- light striking an eye, for example, The physical facts are much the same for us as they are for other creatures. But we are humans, with minds. So (WW's line of thought here)... we have apperception, a process that turns sensations into something different. Apperception turns sensation into intuition. Wundt saw his laboratory's experiments were an effort at learning something about this transformation. One issue that troubled him was: how does the human mind acquire its intuition of space? These three dimensio...