Yearender: Priciest art items sold in 2015

Cy Twombly, Untitled (1970). Courtesy Christie's.

8. Cy Twombly's "blackboard" work, $70.5 million, Nov 11

An untitled "blackboard" work by Cy Twombly sold for a record-setting $70.5 million at Sotheby's in November.

The untitled oil and crayon-on-canvas from 1968, one of the artist's seminal blackboard works meant to resemble chalk on blackboard, was sold to an anonymous client and exceeded Sotheby's' estimate of a sale price in excess of $60 million.