Richard Serra’s The Matter of Time (1994–2005) is a monumental installation permanently housed at the Guggenheim Museum in Bilbao, Spain. Composed of eight massive weathering steel sculptures, including spirals, ellipses, and torus forms, the work transforms the museum’s Arcelor Gallery into an immersive environment where visitors physically move through, around, and within sculptural space. Serra’s use of steel isn’t just about form, but about how space, time, and the viewer’s body interact. As