"The look is a very interesting one. It's a very authentic reflection of progeria patients and that is why the look works so well," Balakrishnan, popularly known as Balki, said, adding that managing Bachchan's appearance was not a daunting task for him.

"I didn't have to manage him. He managed everything himself," said the 'Cheeni Kum' director, adding that he did not use any gimmicks or special effects in the film.

"I have nowhere done any special effects or gimmicks in the movie to make Bachchan resemble a kid. And he is going to be of exactly his height in the film. We haven't made him smaller. But its because of the camera, he looks smaller when you see him in the film."

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"You are not allowed to meet them as they are a very special case and we didn't wanted to be insensitive. We prepared ourselves by watching videos and documentaries of such patients," Balki said.

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