A small jump to begin with, followed by increasingly larger jumps, until finally you find yourself jumping four meters into the air and reaching the transverse spar. How are such jumps possible? The answer: By jumping evenly you set yourself and a counter-weight in motion, and from time to time the inertia of the mass pulls you higher up into the air. A similar process takes place when you jump on the moon.

In the second steel box an almost silent stream of water falls from the ceiling into a pool of water. It is magically illuminated and appears far too regular for a water stream. Try placing your hand beneath it. This perfectly streamlined current is generated by a very sophisticated mechanism invented by Austrian artist Gerhard Zsambok.