Disco Ball in the Living Room?

I ran across these pictures in an Interior Design book at the public library. Of course I was supposed to be studying for other classes but I would usually grab a book or two on Interior Design for my study breaks. And this is what I found........

Generally when someone says "disco ball" I would imagine something a little more.....funky? I really loved this application. I would grab a favorite blanket and lay on the floor after dinner. Maybe with a special someone?