I’d love to have space for a library with high enough ceilings to do that.
Of course if I did have a great-room space I’d have to fit it with both a spiral staircase and a slide of some sort (perhaps fireman’s pole), Just Because. So the net strikes me as an entirely reasonable addition.
I really like the idea of combining a formal library with a few highly informal elements. Same reason my display cabinet contains both genuine and mock elements… fossils, dragon fossils, a stone axe head, a bit of pottery suggesting that Aztecs interacted with the Great Old Ones, …
One of my pet peeves: Too many people confuse serious (which is an attitude) with solemn (which is a pose). A kid working on a puzzle is very serious, and very far from solemn. That’s the healthiest attitude, I think.