bathing architecture in f78v

[davidjackson]

>>I find the perspective in this particular VM image so very weird. The women are sitting on top in green water and then below there's the windows with something blue behind them

I've always thought that this is simply a lack of perspective -  I imagined a sort of above-ground pool with windows in the wall.
But I agree there must be a specific reason between the green and the blue water, but alas, this could simply be something cultural from the time.