From the 4th century however, the end of the leaves tend to turn in, forming what is called the "flame palmette" design. This is the design that was adopted in Hellenistic architecture and became very popular on a wide geographical scale. This is the design that was adopted by India in the 3rd century BC for some of its sculptural friezes, such as on the abaci of the Pillars of Ashoka, or the central design of the Pataliputra capital, probably through the Seleucid Empire or Hellenistic cities such as Ai-Khanoum.[17]