I like films such as Mouna Raagam and Kizhakku Vasaal. Especially Mouna Raagam, for its time, was quite contemporary. It was a beautiful film, it flowed so well.
Obviously, one of the most important things about a film that makes it a classic is that it has to stay in your mind. When most Tamil movies were doing a girl-meets-boy-and-falls-in-love routine, this was so different. That too, it was done within the commercial format. Mani Ratnam had the guts to make a film that interesting with a different storyline. Also the way P.C. Sriram shot the film was so beautiful. Oh, the music too. Again, I like the way ‘Nilave Vaa’ is shot. It’s not like they go into some exotic location but this sort of flows seamlessly, integrated into the narrative. And Ilaiyaraja’s music is such that even when you listen to it ten years later, you still remember the song.