 At some point, the tradition incorporated the idea of a garden setting, perhaps following the Islamic concept of Paradise, an association certainly made when the tradition was mature, although the difficulty of reconstructing gardens from archaeology makes the early stages of this process hard to trace.At any rate, gardens surrounding tombs became established in Islamic tradition in many parts of the world, and existing pleasure gardens were sometimes appropriated for this purpose.Versions of the formal Persian "charbagh" design were widely used in India, Persia and elsewhere.