India, May 6 -- Delhi has hundreds of thousands of street carts. Thousands of them sell cooling drinks through the brutal summer months. This cart is different. It offers two kinds of drinks. Nothing unusual in that. One metal container holds lemon sherbet; the other is filled with rose sherbet. Nothing unusual in that either. The containers are unusual. Both bear eye-catching drawings and labels, almost like the work of a trained artist. The style feels familiar, as if seen elsewhere too. Is the cart owner the artist? "No," says Rajesh, the soft-spoken man manning the stall. "These were painted by some chalta firta painter," he explains, describing the artist as a sort of street vagabond. The artwork was anyway executed six or seven years ...