How to draw a 3 dimensional figure with a single point of focus

This video will teach you how to make a simple 3 dimensional figure leading to a single point of focus. This is a simple drawing skill that can be used to make more complex shapes.https://www.youtube.com/watch?v=ec6VgUfUcdY&list=UUrpyMdODnl8a4oKNhcu3Yiw