One fascinating thing about attending a Tufte seminar is after 2 days of a rigorous run through of, so far as I know, the only really rigorous attempt to create a science of design, the Q&A session was 80% people asking something along the lines of "Yeah, but I should still keep doing what I've been doing, because of these reasons that I want you to say are good." Frankly I was impressed that the man didn't literally face-palm, although judging by his expression he was in his mind.

Sadly, so far as I know he's stopped doing live courses.