The Indus Valley civilization mainly used mudbricks to construct their structures, reason being mudbrick was the most available, abundant, and inexpensive material in the Indus Valley region and lends itself as a useful building material. The Assembly Hall covers an area of 750 square metres. Fortified citadel located on an artificial hill on the western flank encompasses large residential structure, massive granary and two large assembly halls which implies on existence of central government or administration. Looks like you’ve clipped this slide to already. An interested video, maybe you have seen it already, Meluhha: the Indus Civilization and Its Contacts with Mesopotamia. Especially important are numerous small seals predominantly made of steatite which depict variety of animals such as oxen, crocodiles, elephants, tigers, rhinoceros, etc, while depictions of humans are very rare. //