Where do they go at night?
I just amused myself by pondering whether my subject question would constitute a spoiler when it comes to this film.
Anyway, at the end of the first day, after dinner, the mother and son leave the flat and head out onto the streets of Brussels (where it is very dark and I could barely see what was going on). Soon, they return to the apartment and go to sleep. At the end of the second day, when dinner is so "tragically" delayed by the overcooking of the potatoes, the son Sylvain asks whether they "are still going" even after the delay. The mother assents and they leave once again, with much of the same shots as seen for the previous night.
So, is this left mysterious, as just another generic, quotidian, unnamed errand to occupy the entire length of their waking day, or did I miss an explanation or indication of their specific destination each night?