So funny. I grew up reading Heinlein, starting about 5th grade. Read one, then my dad insisted I read them all. Didn’t have to tell me twice. Loved it all! And did not ever know until just a few years ago that he was, like me, pretty much a freak for multi-function, minimalist furnishings. - which is why I sleep on my own design. (But still - Heinlein!)
Tribbles ARE flat cats!