The four directors who are shown onscreen, are indeed real life directors off screen. Even their characters are also sketched based upon their real lives
All stories narrated by the directors in the movie are shot in monochromatic light. Aparna Sen's story is shot in purple, Chiranjeet's story is in red, Goutam Ghosh's story is shot in green, and Parambrata's story is in black & white.
Srijit Mukherji very smartly figures in the stories of Jiyo Kaka & Hawa Bodol by the imagination of Parambrata Chattopadhyay as a director as he actually directed these movies. So Cool