This week Marshall Vandruff takes us through an introduction to perspective using a very straightforward and engaging style to describe the core concepts of angles and their relationship, tricks of perspective, and more. The video serves as an introduction to a larger series of videos he had recorded way back in 1994 and has made available for a very reasonable $12 for the full set. They're very analog, but nevertheless effective, and the price as hard to beat.
In any case, I think you'll find that if you only take one of his videos, this one does a really great job of grounding you in the fundamentals.
