"dynamic extrude"

 From:  Michael Gibson
3966.18 In reply to 3966.16 
Hi Burr, so another way to describe it is that "box modeling" usually means you actually start out literally with a box and then start dicing up some faces and then pull some of those faces outwards to make new protrusions to make things like arms, legs, etc...

The video that you were showing is not really very similar to that method, you're showing making a new surface of revolution starting from nothing by picking some points to create it, not modifying a box like box modeling.

- Michael