Architecture:

The architectural style of  India underwent a drastic  change after the Turkish conquest. The Sultans and their nobles insisted on having arches and domes and competent Indian masons succeeded in building them. The first surviving example of arch is Balban's  tomb, dated 1280, and of dome, Alai Darwaza, dated 1305. It was the change in bilding  technology accompanied by  the introduction of lime mortar that made possible the change from trabeate architecture  to arcuate style. The principle of  true arch seems to have been  known in ancient India, but somehow large arches could not be made. However, false arches were constructed in  ancient times.  Use of  lime mortar made it possible to waterproof floors  and walls for tanks. Thus, it became possible to build  tanks and vats such as those needed for producing India's  major dye, indigo.