Mosaic is the art of creating images with an assemblage of small pieces of colored glass, stone, or other materials. It is a technique of decorative or interior decoration. Most mosaics are made of small, flat, roughly square, pieces of stone or glass of different colors, known as tesserae; but mosaics, especially floor mosaics, may also be made of small rounded pieces of stone, and called "pebble mosaics." Mosaic Art: The mosaic and inlay decoration too were profusely used in the Mughal buildings. In the time of Akbar, the mosaics were made from small tesserae which were combined in Persian geometrical patterns. But in Jahangir's reign pietra-dura began to be utilized for inlay work. The earliest example of the use of pietra-dura inlay seems to have been made in celebrated Jag Mandir water-palace in the Pichola Lake at Udaipur and the Itmad-ud-daulah's tomb at Agra. In the time of Shah Jahan pietra-dura superseded the older mosaic ornamentation. Many of Shah Jahan's buildings in the forts of Delhi and Agra were decorated with pietra-dura inlay. Jahangir's tomb at Shandara, the Sheesh Mahal in Lahore and the Taj Mahal at Agra are fine examples of the beautiful ornamentation of the pietra-dura art.