She said she was in the practice hall doing Marichyāsana III, performing the āsana the way that Mr. Iyengar had taught her, the day before. Guruji stopped her as she was doing the āsana and asked her what she was doing. Astonished she replied in innocence that she was doing what he had worked on with her previously. He was not pleased by her account and admonished her. She was bewildered as I too would have been by this response from the Guru. Though I can't recall her words exactly, the crux what Mr. Iyengar was impressing upon her was that you should come to the āsana every day as if you were treading a new path, walking to the next destination on your journey, not retracing steps on the path that you had already trodden. You build on the work like walking a trail or reading a book. Do not re-read or retrace your steps. See what is on the next page, or beyond that horizon.
Thinking of Guruji's practice and how much of a beacon it still is for us all to aspire too, it's obvious even in the stills that he is not just "doing", he is thoughtful not wasteful of his time. He is exploring. Āsana, you have to let go of what was, let it evolve just as once the studio is complete, it will evolve beyond the vision I have for it.
Abhiji said we were all of us fortunate to have been born in this time, when such great beings existed that could light the way of this great exploration. Guruji was and is an especially bright light still casting an his influence and touching us all.