From my long train journey from Karachi to Quetta. I took this picture through the window while we had stopped at a station somewhere in Baluchistan. My train probably looked exactly the same. I was going 3rd class too.
Foucault's Pendulum is a simple mechanism that shows that the earth rotates. Red lines indicate the rotation of the earth in one hour, but already after a few minutes you will see that the ground beneath the pendulum did turn a few degrees.
It is not allowed to touch the pendulum but it already happened that a father tried to seat his child on the ball.