The journey of filmmaking is so amazing. You start off with great confidence, and develop insecurity at the time of release. When you are ready with the finished product, you are constantly wondering if you have been honest to the story you started out with, if you got what you wanted. One is too close to the project by then to be objective.
In a film like 'Kannathil Muthamittal,' I can't have a Rajnikanth or a Kamal Haasan. If you have a star, the expectation of the film is different. So, you cast according to the subject of the film. Some films are best done with stars because it gives you a base on which if you can get the correct performance, you can reach higher.
Format is just the language. Content is the only thing that is important. Form is like handwriting. Whether you write in a scribble or clean handwriting or type it, the content remains the same. You want to write in clean hand, in a kind of a clear format only because it is aesthetically pleasing. I can scribble, that's also fine.
When you break new grounds and try to do something different, it's always a high. I remember the first time we did a whole song in slow motion with lipsync for 'Geetanjali.' It was not prevalent at that time. We just had a method and we tried to do that. We weren't sure whether it was going to work, but that is the kind of risk you take.