Sotheby's Vision: The Extraordinary Collection of Theodore and Ruth Baum Evening Auction Could Realize $74.4m

3 min read · 03 Nov 2026

Green Book of Barbara Guest by Joan Mitchell estimated at $12m (low) to $18m (high). Image courtesy of Sotheby's

Untitled by Mark Rothko estimated at $10m (low) to $15m (high). Image courtesy of Sotheby's

Dimple by Ed Ruscha estimated at $10m (low) to $15m (high). Image courtesy of Sotheby's

Concetto spaziale, Attese by Lucio Fontana estimated at $4m (low) to $6m (high). Image courtesy of Sotheby's

GA1 by Alberto Burri estimated at $4m (low) to $6m (high). Image courtesy of Sotheby's

Green Book of Barbara Guest by Joan Mitchell estimated at $12m (low) to $18m (high). Image courtesy of Sotheby's

Joan Mitchell Green Book of Barbara Guest (1960) is the highest-value lot announced by Sotheby's in its 'Vision: The Extraordinary Collection of Theodore and Ruth Baum Evening Auction' in New York on November 16.

Pre-sale low estimates total $74.4m.

Preview snapshot

24 works are for sale.
Estimates total: $74.4m (low) and $109m (high), excluding premiums.
0 lots have undisclosed estimates.

The highest-value lot announced is: Joan Mitchell, Green Book of Barbara Guest (1960), which is estimated to sell for between $12m and $18m. The work is backed by a guarantee. It has been traded twice in the past.

Guaranteed lots

24 works are backed by guarantees, including: Mark Rothko, Untitled (1967). It is estimated to sell for between $10m and $15m. It has been traded 10 times in the past.

Terms and definitions

Guarantees: Sometimes an auction house guarantees to pay a seller for a work, regardless of whether the bidding reaches the reserve price, a figure that is typically confidential.

All figures are accurate at time of publication.

Market

Exclusives

Joan Mitchell

Mark Rothko

New York

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