In its original form, the arch is shaped like the cross-section of a barrel vault. It is called a chaitya arch when used on the facade of a chaitya hall, around the single large window. In later forms it develops well beyond this type, and becomes a very flexible unit, "the most common motif of Hindu temple architecture".
In its original form, the arch resembles the cross-section of a barrel vault. It is referred to as a chaitya arch when used on the facade of a chaitya hall, surrounding the single large window. In later forms, it evolves into a highly versatile unit, becoming the most prevalent motif in Hindu temple architecture.