Please read the below instruction and review all of the corresponding graphics.

A rotation of an object is a turning of it about a straight line called an axis. 3D objects may be rotated on either the X, Y or Z axis. The straight line about which an object rotates is called the axis of rotation. An object can rotate either positively or negatively about an axis. If you look down the axis of rotation, a positive rotation is counterclockwise and a negative rotation is clockwise.

If an object is rotated around a single axis multiple times, the edge stays in contact with the given axis. If an object is rotated around multiple axes, a single point stays in contact with the origin.