lower right in brown felt-tip pen: An / earth / mound for / a room with / a skylight. / The room has a / door at each end. / The floor is carpeted / The earth packed against / one door is mixed with clay / to strengthen the vertical surface / Mound is planted with ground cover. / Stephen Kaltenbach May 1967.
Mr. and Mrs. Herbert Vogel, New York; gift to NGA, 2007.
- Painting, Drawing and Sculpture of the '60s and the '70s from the Dorothy and Herbert Vogel Collection, Institute of Contemporary Art, University of Pennsylvania, Philadelphia, 1975: p. 12.