Rainchain Cistern

A tall narrow rain-working vault stepping down from an elevated catch basin to a round rear storage tank. Rough pearl cloudstone encloses a buoyant pumice frame and a deep translucent blue-ice lining. A compact oval service entrance faces front +Z beneath a projecting rain-basin eave. Graduated hammered-copper cup chains descend along both long sides, with polished lips and greened undersides. At the rear, a rough cloudstone frame holds a stepped blue-ice sluice channel, a thick oval gate, and a copper lifting wheel. Low pumice buttresses visibly anchor the wet mass. Resolve the open basin interior, circular tank rear, sluice, chains and individual cups, wheel, roof transitions, all walls, and every support foot.