What are the postage stamp size stone pieces in the ruins of mohenjo daro?

The postage stamp-sized stone pieces found in the ruins of Mohenjo-Daro are believed to be remnants of the city's advanced urban planning and construction techniques. These small, standardized bricks, made from baked clay or fired mud, were used in the building of houses, drainage systems, and other structures. Their uniform size indicates a sophisticated level of craftsmanship and organization in the Indus Valley Civilization. These bricks have contributed to our understanding of the architectural practices and societal organization of this ancient civilization.