Window between two rooms

Has any of you ever seen that in any single-family house?

Our sauna has windows to the bathroom

There is hardly any other meaningful use

Window between bathroom and bedroom. With frosted glass, I could even imagine it. I know it from various hotels.

Good evening,

Has anyone of you ever seen this in any single-family house?

Already installed several times; from the bathroom to the air space (system), from the kitchen to the hallway, as well as from the hallway to the living room or bedroom to corridor. There are countless possibilities; it always depends on the room layout

Rhenish greetings

hmm such a window between 2 rooms would hardly make sense, as the light incidence would be too low. The window (about 40-50cm high) would then also be installed about 1.90 m above the ground. That doesn't leave much space for the light incidence, does it?