Inlay is the art of using regular, beautiful and colorful triangular or polygonal pieces that are put together like a mosaic. Khatam Kari was first done in Shiraz and after a while it was transferred to Isfahan and now it is known in Isfahan as an original art. When you go to Naghsh Jahan Square, you can see this original Iranian art. . These regular polygons are usually designed between 3 and 10 sides; That is, triangular, pentagonal, hexagonal, hexagonal, octagonal and ten-sided. Arranging these polygons together requires a special skill! These polygons are created with the help of bone and wood, and are placed next to each other.