Science, following Chamberlin, is the holding of multiple working hypotheses. A visual depiction allows us to juxtapose a multiplicity of possibilities simultaneously in space. Because this is usually much more efficacious than stringing them together sequentially, as must be done in an aural presentation, this capacity melds well with one of science's principal goals, the search for causes. Even though establishing cause empirically is a task of insuperable difficulty, it merges with another great Aristotelian theme-the search for relations between things apparently disconnected. It has often been found that when we find "similitude in things to common view unlike," we can turn old facts into new knowledge. "Newton did not show the cause of the apple falling, but he showed a similitude between the apple and the stars." Newton was content to be able to bring many diverse phenomena under a few principles, even though the cause of these principles remained undiscovered. Both Hume and Mill declared that all reasoning whatsoever depends on resemblance or analogy, and the power to recognize it.