The 73-year-old star took to his official blog to share his experience, and shared a string of photographs in which he is seen wearing khaki trousers, loose fitted shirt and a training mask, which is covering half of his face.
"The masked wonder on the streets of crowded Delhi and ne'er an eye is raised...this is what what life is all about 'buddy'. Its called indifference, unrecognisable, and even if recognisable not interested in recognising ... happens to all that were once recognisable ... shall happen to all ... its not something that shall bring the oceans at your feet," Big B shared.
In one of the images, he can be seen crossing a busy junction of the capital, and in another photograph, he is walking in solitude with just one passer-by - a street dog.
The "Piku" star also shared: "See what I mean ... this is one of the most crowded and busy crossings in my part of the city ... and... no problem. Except for this fellow. Few and far...and the oblivion persists."
The social-thriller is directed by National Award-winning Bengali director Aniruddha Roy Chowdhury, who is stepping into Hindi films with the project. The story line of the film, which also stars Taapsee Pannu, is still under wraps.
After enjoying a walk with no cameras swarming around him, Amitabh also lauded the make up artist.
He said: "The make up artist does supreme ... the hours of work on the face sublime and the efforts made to carry forward a story, simply stupendous."
On the professional front, the actor has wrapped up shooting for "Te3n".
Sharing the progress of Ribhu Dasgupta's directorial ", he shared: "'TE3N' is now on final post productions ... music song dub and its final colouring ... edits are done and satisfactory."