Almost every object you see has a structure or form based on either the cube, cylinder, cone or the sphere.
Any object may be based on one or a combination of all four shapes.

Have you noticed
that there are four
equal quarters
in an elipse.

Use a soft pencil to make the basic shape, ink over the best lines and then erase the pencil marks.

Press F11 for a full screen view
and press it again to return to normal view.