From the 1960s until his death in 1986, German artist Joseph Beuys produced some 557 multiples — small-scale portable and affordable pieces that captured an element of his practice. Joseph Beuys: Multiples from the Reinhard Schlegel Collection, opening today at the Chelsea gallery Mitchell-Innes & Nash, includes over 500 such works by Beuys, the largest exhibition of his multiples yet shown in New York.