Diamond Dust

This would be like Schrödinger's Canvas...

A work of art placed under wraps along with a radioactive decay triggered mechanism that at some unknowable point instantaneously and completely disintegrates the paint.

What you then have is a superposition of art and non-art, that only becomes one or the other when the wrap is removed, the canvas inspected, and the wave function collapses.

Of course, the whole thing is art, but the question is whether the canvas contains art whilst its erasure remains unknown.