If your house is made of polystyrene, your furniture can be too. After going to team lab in Japan and experiencing a room that was all beanbag, we built a room in our house that is all beanbag.
Polystyrene sticks to everything, by the way. https://i.postimg.cc/sgb5n2bf/20200114-134910.jpg
A few years ago, the neighbor kid from where my parents live made a hole in a wall of his room leading to outside.