1973/93: The Hourglass Sanatorium 1973

 Trailer:

Watch movie:

https://youtu.be/kj9lue3KqKs?si=HH6iR9dLG-LZMn_B 

 https://en.wikipedia.org/wiki/The_Hourglass_Sanatorium

https://www.truemythmedia.com/true-myth-media/reviews/thehourglasssanatorium 

https://filmobsessive.com/film/film-analysis/film-genres/surrealism/the-past-is-the-present-in-the-hourglass-sanatorium/ 

https://horrorcultfilms.co.uk/2015/09/the-hourglass-sanitorium-1973-on-blu-ray-7th-september/