In the late 80s or 90s, I remember watching video online of a series of lectures in a college physics course at UCAL. One of the sponsors was the Annenberg Foundation. Most of the time the video was shots in the lecture hall, but there were also cutaways to an empty black space in which an equation or calculation would appear and as the voiceover articulated the operations necessary to solve the original equation it would change in time to reflect the effects of each step; one could watch as numbers, variables, signs were struck through, faded in or out, moved around, etc.; thus, “showing your work” was being done fluidly in time instead of frozen in space the way it would be if one were doing the math on paper.
So, to my questions: 1. Does anybody know the video I’m talking about and where to find it? (I've been looking on and off for years and never have); 2. Does anybody understand what I’ve tried to describe going on in the cutaways and what I need to make my own?
