The vision of the Universe that is so vivid in our minds is framed by a few iron posts of true observation — themselves resting on theory for their meaning — but most of all the walls and towers in the vision are of papier-mâché, plastered in between those posts by an immense labor of imagination and theory.

In: John Archibald Wheeler and Wojciech Hubert Zurek (eds.), Quantum Theory and Measurement