the cardinal directions. These are in stone, though clearly adopting forms developed in wood. They and the walls of the stupa itself can be heavily decorated with reliefs, mostly illustrating the lives of the Buddha. Gradually life-size figures were sculpted, initially in deep relief, but then free-standing. Mathura was the most important centre in this development, which applied to Hindu and Jain art as well as Buddhist. The facades and interiors of rock-cut chaitya prayer halls and monastic viharas have survived better than similar free-standing structures elsewhere, which were for long mostly in wood. The caves at Ajanta, Karle, Bhaja and elsewhere contain early sculpture, often outnumbered by later works such as iconic figures of the Buddha and bodhisattvas, which are not found before 100 CE at the least. Buddhism developed an increasing emphasis on statues of the Buddha, which was greatly influenced by Hindu and Jain religious figurative art, The figures of this period which were also influenced by the Greco-Buddhist art of the centuries after the conquests of Alexander the Great. This fusion developed in the far north-west of India, especially Gandhara in modern Afghanistan and Pakistan. The Indian Kushan Empire spread from Central Asia to include northern India in the early centuries CE, and briefly commissioned large statues that were portraits of the royal dynasty. Shunga Dynasty (c. 185 BCE – 72 BCE) With the fall of the Maurya Empire, control of India was returned to the older custom of regional dynasties, one of the most significant of which was the Shunga Dynasty (c. 185 BCE – 72 BCE) of central India. During this period, as well as during the Satavahana Dynasty which occurred concurrently with the Shunga Dynasty in south India, some of the most significant early Buddhist architecture was created. Arguably, the most significant architecture of this dynasty is the stupa, a religious monument which usually holds a sacred relic of Buddhism. These relics were often, but not always, in some way directly connected to the Buddha. Due to the fact that these stupas contained remains of the Buddha himself, each stupa was venerated as being an extension of the Buddha's body, his enlightenment, and of his achievement of nirvana. The way in which Buddhists venerate the stupa is by walking around it in a clockwise manner. One of the most notable examples of the Buddhist stupa from the Shunga Dynasty is The Great Stupa