Designer Sabyasachi Mukherjee, who styled the look of Sanjay Leela Bhansali's much-awaited film "Black", says the power and grace of Amitabh Bachchan and the enormous vitality and talent of Rani Mukherjee just blew him away.

"Black was a brilliant experience, literally a once in a lifetime experience," tells Mukherjee in an interview.

"Working with Amitabh Bachchan is absolutely fabulous, he is like god. He is by far the most down-to-earth person I've ever met. Throughout the shoot, he was absolutely on time every single day. In fact, he used to be always five minutes early.

"I was completely in awe of him."

Mukherjee gave the dark clothes, well fitted and delectably understated clothes to Amitabh and Rani in Bhansali's surreal tale of a blind girl and her coach.

He said seeing Rani work was magic. "She can virtually do anything. She is so multi-faceted and she is very open to experimentation. From body language to little details and touches, Rani is very deft."

"I think she is turning out to be the true successor of the lofty standards set by Kajol," Mukherjee said.

As a designer, "Black" was a huge challenge of Mukherjee who was asked to do something diametrically different from the splash and flamboyance that he is usually associated with.

"Here the look was so intense and understated that I couldn't bring anything that I usually do. None of the play of colours and that special juxtaposition and rhythm that colours bring.

"It was particularly fascinating for me because the look was so monochromatic, so minimalist. It was pure, like Zen, and I seriously feel that I evolved to a new plane while doing that look."

But he won't do a film again in the near future. "I like doing a number of things at a time and doing a film is very, very taxing.

"It also means that you completely devote almost two years to one project and that is a long time. I want to concentrate on my fashion business and not spread myself too thin," said Mukherjee who said no to Bhansali's "Bajirao-Mastani".

"One thing at a time."