Nyein Chan Su's Energy of Lightness.

For this installation art, Burmese artist Nyein Chan Su wrote:

A heavy, solid, spiny and dangerous object hangs over the fragile balloons below. When the rope is released, the object will fall and crush the balloons. Or, perhaps the balloons will disperse and escape the impact of the spiny object.

We will never know:

Unfortunately, the installation "Energy of Lightness" could not be turned into a performance, as planned, due to certain circumstances.

Link - via Ioan