As originally laid out, the sculpture by the California Conceptual artist, Robert Irwin, had nine flowering plum trees placed symmetrically on a 60 foot x 60 foot grid. Each tree rested in a planter that was then enclosed in wire mesh to form a "room." After the Public Safety Building's demolition, the sculpture was moved to a visible site on the University of Washington Campus near Red Square. The sculpture underwent a few changes in its new location. While the mesh was originally covered with a blue vinyl, (which has deteriorated and disappeared), the new wire cages were coated in purple vinyl and Hawthorne trees replaced the original plums.

The Nine Spaces, Nine Trees Sculpture, a conceptual art piece by California artist Robert Irwin (b. 1928), was never popular in its original location. The Henry Art Gallery became interested in it and had it dismantled and moved to the University of Washington, Seattle, Campus in 2006. It was re-erected in the summer of 2006 and re-dedicated in 10/2006 on a portion of land to the west of Odegaard Undergraduate Library and east of the Henry Art Gallery.

PCAD id: 6621