Many geeks have built impressive constructions from cardboard. Cosplayers and LARPers may have used it in costume and props. Tabletop gamers may well have built GM shields and dice towers. You’ll find wargamers with whole towns build from paper.
Building an armoured duck fort – for a cat – out of cardboard is a whole new thing though. That’s what PrefabCat did for Dinni.
Via Geyser of Awesome.