In 2021, Hammons collaborated with the Hudson River Park Trust and the Whitney Museum to create "Days End". This piece is a "ghost monument" to the late artist, Gordon Matta-Clark. Specifically, the art serve as a tribute to Matta-Clark's 'Pier 52' by creating a structural frame of the warehouse that made up the artist work. Matta-lark had cut five openings in the walls, ceilings and roof of an abandoned pier shed. This will be Hammons only permanent public piece. The piece itself is made of steel rods, with half being on land and the others being on steel piles in the Hudson River.