Robert Rauschenberg Canyon 1959
No tax is payable under the settlement, and the Rauschenberg has been donated to the Museum of Modern Art . The case has left no guidelines as to whether the IRS would in another case be entitled to set a value on a legally unsaleable artwork, but in this instance common sense seems to have prevailed.
-via Art and Artifice
In case you missed it, the IRS was trying to tax and penalize the inheritors of this piece over $40 million dollars even though, due to the stuffed bald eagle, it is unsellable.