'Mr.Bachchan is playing a reclusive,

Mr.Bachchan is playing a reclusive, genius maths professor in the film. For his look, I first remembered how my teachers used to look. I visited various colleges to see how professors are dressed there. 'The first thing that I noticed was that all of them were very simple and they were not really bothered about their outward appearance. So for Mr.Bachchan's look I decided to go for authentic materials to make the character look close to reality,' she said.

Sumber: http://bolliwoodstories.blogspot.com/2010/02/mrbachchan-is-playing-reclusive.html