What is an ellipse?
Ellipses are extremely important and notoriously annoying to draw. You'll find them all over the place in mechanical drawings. Cars, space ships, tanks, machines - anything man made will probably make extensive use of ellipses.
They also tend to feature prominently in organic drawings, especially as we look at the cross-sections of sausage-like forms.
Let's take some time to explore what they are, how they behave, and how they can be used.