I hope that you don't mind my "playing" with your photograph!
Using Photoshop Elements, I opened the image in RAW, reduced the noise a little and slightly increased contrast and saturation before opening it and giving it just a little touch of sharpening. Perhaps the saturation is a little strong, but see what you think!
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.