Collar design inspired by a sequence of arches – the Chandrashala – pencil + photoshop (above) Chandrashala is the term most often used to describe the circular or horseshoe arch that decorates so many Indian cave temples and shrines. The arch is shaped like the cross-section of a barrel vault. When used on the facade of a chaitya hall, the stupa, it is called a chaitya arch –  http://dictionnaire.sensagent.leparisien.fr/Chandrashala/en-en/

Sketch of an Interior of an Indian representative building. That emphasizes the importance of the Chandrashala as a module in Indian’s architecture. – pen and markers (below)