Fun article about Ben Hescott who has some unique - and impressive - approaches to teaching an abstract topic:
Q. Did you experience an “aha’’ teaching moment?
A. My first time teaching, I was using PowerPoint slides. One student kept saying, “I don’t see it.’’ So I turned off the computer, grabbed a piece of chalk, and went through the material slowly on the blackboard, without notes. Afterward, the kid said, “You’re a really good teacher when you’re not using PowerPoint.’’ That changed everything." (from The Boston Globe)
You have to read the whole interview!