 Johnson's tall and robust figure combined with his odd gestures were confusing to some; when William Hogarth first saw Johnson standing near a window in Samuel Richardson's house, "shaking his head and rolling himself about in a strange ridiculous manner", Hogarth thought Johnson an "ideot, whom his relations had put under the care of Mr. Richardson". Hogarth was quite surprised when "this figure stalked forwards to where he and Mr. Richardson were sitting and all at once took up the argument ... [with] such a power of eloquence, that Hogarth looked at him with astonishment, and actually imagined that this ideot had been at the moment inspired". Beyond appearance, Adam Smith claimed that "Johnson knew more books than any man alive", while Edmund Burke thought that if Johnson were to join Parliament, he "certainly would have been the greatest speaker that ever was there". Johnson relied on a unique form of rhetoric, and he is well known for his "refutation" of Bishop Berkeley's immaterialism, his claim that matter did not actually exist but only seemed to exist: during a conversation with Boswell, Johnson powerfully stomped a nearby stone and proclaimed of Berkeley's theory, "I refute it thus!"
