Why is Shah Rukh Khan playing a man with dwarfism in Zero?

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In May 2016, it was revealed that Shah Rukh Khan is taking on a major acting challenge. He will be playing a man with dwarfism in film Zero.

Director Anand L Rai had spoken about his collaboration with SRK saying, “He has seen life not just as an actor but also as a person. It’s the story of a man who is just three-feet-one-inch tall. Nobody understands ordinariness better than Mr Khan. I’m looking forward to seeing him in the dwarf avatar.”  More……