Ralph Humphrey's Portland is more aggressively physical than chromatic, as the shaped canvas reasserts the painting's physical structure. Known as one of Humphrey's Constructed Paintings, the present lot leans toward monochrome, yet there is a certain luminosity that angles through the vertical slats that line the surface of the canvas. Inspired by both Theodoros Stamos and Mark Rothko, Humphrey once mused, “The work should create its own light.”