The 75-year-old, who had a script reading session on Friday, took to his blog to reflect upon the day.
He wrote, ".there is that small matter of 'Brahmastra', the next film on line starting in a couple .. and the look and feel tests and the introduction to texts of the script, and the prep for the readings among the three of us ..Alia, Ranbir and Ayaan the director .."
"Its a routine that never existed in my time .. but the thoroughness of preparation and detailing of every aspect in the making is quite quite remarkable ..(sic)"
He also posted 3 selfies from their prep with his adorable expressions and captions but made a typo in the first one calling Ranbir Kapoor 'Ranveer'.
He soon corrected it too by posting another moment from the same selfie and wrote in caption - "Typo .. that's Ranbir not Ranveer"
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The 'Thugs of Hindostan' star further revealed he is side-by-side preparing for his next flick with Sujoy Ghosh.
"along side goes the prep and looks for the next after .. also in a few .. for Sujoy Ghosh .. the absolutely mad Bong .. but a delightful company ! will be my 2nd as a director and a production done earlier .. all to be shot in regions away from the shores of the land ..(sic)"
(With inputs added in ANI report)