The source for these adventures in decorating provides no specific information on date or locale. My own best guess would place them mostly in the 1970s at a point where the visual revolutions of the sixties had securely established themselves as mainstream. One also senses that these are not American rooms. Oddly, some look to me like actual life-size rooms while others appear to be dollhouse rooms. People do often complain about misinformation (or lack of context) on the internet, but it can also be an advantage to know very little for sure about what you look at. The fancy plays more freely.