The follow up is "How to draw Bézier curves recursively": http://scratch.mit.edu/projects/11790017/
This is a geometric interpretation of De Casteljau's algorithm to construct a Bézier curve. There are many references available, here is one: http://www.scratchapixel.com/lessons/3d-basic-lessons/lesson-11-rendering-the-teapot-bezier-surfaces/b-zier-curve/
