Bricks made from oyster mushroom mycelium (Pleurotus ostreatus) proved strong, lightweight, and surprisingly sustainable. By growing mycelium through mixtures of clay, lime, rice straw, and sawdust, researchers created building blocks with solid compressive strength, low density, and better water resistance when clay was added. The best-performing blend produced durable bricks while reusing agricultural waste and avoiding high-carbon materials like cement. The result: a renewable, low-energy construction material that could support affordable rural housing while dramatically reducing environmental impact.