Help - film title needed

Hey World!

New member
Trying to find the title of a movie.

Sorry, I can't remember much about it

I think there was a kinda of observation room which had a window. The window allowed those in the observation room to go through to different places or histories in time. I remember one scene where someone came back through the window and every one in the observation room was moving in slow motion.

I think the film was made in the 1970's.
 
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