"Rubber band" is a terrible example (because the most notable freature of rubber bands is that they change length). Far better to use "piece of string," for instance. Also, a diagram might help.--JBL 23:29, 7 January 2007 (EST)

I was hoping somebody would take care of replacing rubber band with string for me :) - that was how it was originally written, but it stopped right in the middle of the construction and said "(somebody else finish this)"... I'll take care of some diagrams on Sunday if you'll take care of explaining how to construct an ellipse.--solafidefarms 21:52, 8 January 2007 (EST)