This was an excellent lesson. As you said, an education. I learned a lot! In the screen cast video I was amazed at how the changes in value made the figure pop or receed. It was a lot of video and work for you but I was glad for all of it, so thank you! The Sargent video was wonderful too. I felt a real sense of accomplishment completing the Begin Here unit. In spite of mistakes and overworking the head beyond the ability to erase, I feel like overall things came together from the previous lessons.
Thanks for all you do to help your students build for success!