Every part of the truck gets decorated. The driver's cab is often the brightest, with painted flowers, peacocks and patterns. The back of the truck has its own picture - a mountain, a famous building, a tiger, or sometimes a film star. The wooden side panels have carved patterns and little chains of metal that jingle as the truck moves.
It can take a team of artists six weeks to decorate just one truck. Painters, woodcarvers, metal workers and chain makers all work together. By the time it is finished, no two trucks in Pakistan look exactly the same. Drivers are very proud of their lorry's design and often have a favourite poem or saying painted on the bumper.
Drivers spend weeks at a time away from home, driving across mountains and deserts to deliver food, building materials and clothes. The colourful decoration makes the lorry feel like a home on wheels. The mirrors and bells are also said to bring good luck and a safe journey.
Truck art is now famous around the world. There are exhibitions of it in art galleries in London, New York and Tokyo. Some artists in Karachi and Rawalpindi now sell small painted boxes, mugs and helmets in the same style, so people anywhere can have a little piece of Pakistani truck art at home.