LAY your hands upon your desk, side by side.
Which side shall we call the right side? The left side?
Put your hands on the middle of your desk
 on the side farthest from you. That part is the back of
Think which is the front of your desk. Put your hands on the front of your desk.
Who sits on your right hand? On your left? At the desk in front of you? At the desk behind you?
Turn round. Who is on your right now? On your left? Before you? Behind you?
Turn again. Who is now on your right? On your left? Before you? Behind you?