Tell me again about the public trust (fine rugs from the William Clark collection edition)

The Corcoran is selling 25 fine rugs and carpets at Sotheby’s, including "one of the most iconic and important carpets ever to appear at auction."  Iconic, important, and held in the public trust, to be accessible to present and future generations ... just as long as those future generations make it to the museum by June 5th.