In addition to displaying the scene from particular axes, Blender lets you use the NumPad to revolve around the center. The steps are as follows:
Press the 7 key on the NumPad to get the Top view.
Press the 4 key on the NumPad several times to rotate the view negatively on the Z axis.
Press the 6 key on the NumPad several times to rotate the view positively on the Z axis.
Press the 1 key on the NumPad to get the Front view.
Press the 4 key on the NumPad several times to rotate the view negatively on the Z axis.
Press the 6 key on the NumPad several times times to rotate the view positively on the Z axis.
Pressing the NumPad 7 key shifted your view to the Top view. This let you see how pressing the NumPad 4 key rotates the view counter-clockwise around the Z axis. Pressing the NumPad 6 key rotates the view clockwise. This is useful when you want to inspect an object carefully. It lets you rotate around the scene in 15 degree...