What is "sesham"

Sesham is a 2002 Malayalam language drama film written and directed by T. K. Rajeev Kumar with Jayaram, Geethu Mohandas, Biju Menon and P. Balachandran in the star cast. The film zooms into the lunatic asylum and probes the tenuous realms that separate the sane from the insane. Jayaram's portrayal of the character Lonappan is widely regarded as the best in his career. The film met with critical acclaim and won numerous awards including several Kerala State Film Awards and Asianet Film Awards. It was, however, a box office flop.