All of Koons's best art - the encased vacuum cleaners the stainless-steel Rabbit (the late-twentieth century's signature work of Simulationist sculpture) the amazing gleaming Balloon Dog and the cast-iron re-creation of a Civil War mortar exhibited last month at the Armory - has simultaneously flaunted extreme realism idealism and fantasy.

The best artist has that thought alone Which is contained within the marble shell The sculptor's hand can only break the spell To free the figures slumbering in the stone.

Photography suits the temper of this age - of active bodies and minds. It is a perfect medium for one whose mind is teeming with ideas imagery for a prolific worker who would be slowed down by painting or sculpting for one who sees quickly and acts decisively accurately.