Question: Which artists are responsible for the sculpture permanently installed northwest of Valentine, Texas and about 26 miles northwest of a city in the high desert of the Trans-Pecos, located between the Davis Mountains and Big Bend National Park?
Sentence (from "Marfa, Texas"): It is the county seat of Presidio County, and its population as of the 2010 United States Census was 1,981.
Relevant evidence: No