festival called the Chennai Sangamam, which showcases not only various art of Tamil Nadu, but also from the neighbouring states, like kalari (from Kerala), which is a major attraction, is held in January every year. The Speciality of Chennai Sangamam is that the various programmes are held near or at the various famous landmarks in the city so that everyone in the city has access to the programmes and there is no fee charged for entry for any of the programmes. Pookolam, a form of art that uses coloured flour to create patterns and designs, comes from Kerala, but can be seen in abundance at the time of Onam. The city has a diverse theatre scene and is one of the important centres for Bharata Natyam, a classical dance form that originated in Tamil Nadu and is the oldest dance of India. An important cultural centre for Bharata Natyam is Kalakshetra, on the beach in the south of the city. In 2012, a group of five Bharatha Natyam dancers from Chennai performed at the India Campaign during the 2012 Summer Olympics. Chennai has been featured in UNESCO Creative Cities Network (UCCN) list since October 2017 for its century-old musical tradition. Chennai is also home to some choirs, who during the Christmas season stage various carol performances across the city in Tamil and English. Cityscape Chennai is broadly divided into four regions: North, Central, South, and West. North Chennai is primarily an industrial area, with a higher population density and narrower roads. South and West Chennai, previously mostly residential, are rapidly becoming commercial, home to a growing number of information technology firms, financial companies and call centres. The city is expanding quickly along the Old Mahabalipuram Road and the Grand Southern Trunk Road (GST Road) in the south and towards Ambattur, Koyambedu and Sriperumbdur in the west. Central Chennai comprises residential elements, but is primarily home to the downtown area, and surrounding areas, the most visited by travellers to the city. Economy Recent estimates of the economy of the entire Chennai Metropolitan Area range from $78.6 to $86 billion (PPP GDP), ranking it from fourth- to sixth-most productive metro area of India. Chennai has a broad industrial base in the automobile, computer, technology, hardware manufacturing and healthcare sectors. , the city is India's second-largest exporter of information technology (IT) and business process outsourcing (BPO) services. A major part of India's automobile