Overview:

Like wheels, in perspective, cylinders and bottles use ellipses to suggest round shapes. These ellipses are symmetrical along a major and minor axis and are continuous smooth curves with no points. The major and minor axes are perpendicular to each other. For ellipses to appear as part of the cylinder or round object, all visual centers must be the same, and the angle of the minor axis must be parallel to this visual center axis. The visual center defines the angle of the object.

Ellipses:

Cylinders:

Bottles: