Ratan Tata's purported remarks expressing surprise at fellow industrialist Mukesh Ambani living in a billion-dollar mansion in Mumbai has sparked off a controversy today (May 22). The Tata group Chairman was quoted by London's Times newspaper as having said, "It makes me wonder why someone would do that. That's what revolutions are made of. The person who lives in there should be concerned about what he sees around him and [asking] can he make a difference.