Tanks also serve as reservoirs for agricultural reasons. Some temple tanks involve compact shrines at their center. The main supplies made use of were Wooden and terracotta, but architects slowly moved on to brick and stone, Primarily sandstone, granite, schist, and marble. No mortar was used in the older temples https://hanumanjimandir.food.blog/2025/03/18/hanuman-mandir-adelaide-a-divine-haven-for-devotees/