Telestrator–the electronic crayon

From Slate, a well-crafted video about the Telestrator, John Madden, and beyond:

http://www.slatev.com/player.html?id=1399217125

The Telestrator maps images, as described in the first chapter of Beautiful Evidence, with pieces of that chapter here:

https://www.edwardtufte.com/bboard/q-and-a-fetch-msg?msg_id=0001V7&topic_id=1