The creation of this monumental 22-tonne piece entailed great technical difficulty. The work comprises three distinct and completely asymmetrical steel sheets joined by a series of rivets. Walking around the work provides two very different perspectives: the contrast between full and empty. From behind, the viewer sees a solid piece which raises itself proudly towards the sky. From the front, the opening, space, emptiness. For Chillida, space should be accessible. Once inside the sculpture, its own shapes become wave-like. They seem to take on movement and turn their gaze upwards in search of the light, hoping to reach it not just physically but poetically and spiritually.