In reply to Blue Straggler:
The original writer of the film, Alain Robbe Grillet, the most eminent exponent of the Nouveau Roman* movement, does not intend that the spectator leaves with a firm view. He observed of the viewer's experience and his own intentions: "Two attitudes are then possible: either the spectator will try to reconstitute some 'Cartesian' scheme – the most linear, the most rational he can devise – and this spectator will certainly find the film difficult if not incomprehensible; or else the spectator will let himself be carried along by the extraordinary images in front of him [...] and to this spectator, the film will seem the easiest he has ever seen: a film addressed exclusively to his sensibility, to his faculties of sight, hearing, feeling."
In other words you can fight to construct a logic that will continually elude you. Or sit back and enjoy. The choice is yours.
* https://en.wikipedia.org/wiki/Nouveau_roman