Tarkovsky and the other side

The other night, unable to sleep, I put on Mirror my laptop, and placed it next to my pillow. I often find that trying to read subtitles in a difficult Russian film at 3am makes sleep a little easier.
This night it didn't work. I went through Mirror for the 10th time. What I had forgotten was the amazing scene with Ignat, and Maria Nikolaevna. Ignat's mother leaves him in his father's flat waiting for Maria. He sees his mother out the door, crosses the hallway and is disturbed by the the sound of cups. Maria is there, at the table, looking for Ignat. There is a maid as well. And what was an empty hallway in the previous shot now includes chairs, mirrors, and lighting. She asks him to read from a book on one of the shelves, Pushkin's letters. As she listens the light in the room changes, as if the sun were slipping in and out from behind clouds.
Just as he finishes there is a knock at the door. Or rather Ignat looks to the door as if there was a knock. And Maria encourages him to open the door. But I could hear no knock.
He opens the door. It is an old woman. She looks confused, apologises, says she has the wrong flat and leaves (she looks like Ignat's grandmothers - we see photos of her later).
Ignat closes the door and goes back into the flat, but Maria has gone.
On the table, a circle of steam remains from where Maria's tea cup had rested. It quickly disappears.