"Microsoft Bob presented screens showing a house, with rooms that the user could visit containing familiar objects corresponding to computer applications, such as a desk with pen and paper and a checkbook. Clicking on the pen and paper would open the system's word processor."
Fun, but most themes were basically unusable.
[0] https://en.wikipedia.org/wiki/Kaleidoscope_(software)
Some samples: https://web.archive.org/web/20110709175639fw_/http://www.kal...
(The one I used the most, was Ozymandias II).
Something like Microsoft BOB takes the metaphor too far and gets weird.
I think this project leans on it a little too hard, but a balanced approach can make the systems quite charming and provide a nice juxtaposition to the very austere hardware we have these days.
That may have more to with the skills of the implementors, as opposed to the concept, as a whole.
I do find modern "flat" design to be less "fun," but I get a lot more done with it.