All was a retrospective of the Italian artist at the Guggenheim Museum. It displayed 128 works that hang from the rotunda.
Here is a part of the NY Times review; for more see this webpage:
“This unusual show has been described by Mr. Cattelan as his swan song. Although only 51, which is young in artist years, he has announced that he is retiring from the job of making art. Perhaps to celebrate, he has turned his retrospective into something of a final blowout artwork, one made of earlier pieces — 128 of them to be precise — and involving some delicate engineering. Mr. Cattelan’s entire artistic output, excepting two works whose owners declined to lend them, hangs in a gigantic distended mass from cables connected to an aluminum truss near the top of the museum’s rotunda. Titled “All,” it fills one of the most famous architectural voids in the world with what surely ranks as one of the largest, most complicated, visually muddled mobiles in the history of art.”