One of my first jobs was in a warehouse and we had a lot of dead time. My first week there they asked me how I want my area set up. They would move anything I wanted. So I had all the shelves set up to make a room. From the outside it just looked like shelves set up in a square. The opening could easily be covered by two larger boxes that we would just slide over to cover the opening.
Only the maintenance crew and the CEO’s son knew about it. I came to work after a week vacation and the room was bigger. I slide the “door” open and everyone’s inside feet kicked up watching a movie on a laptop. They moved the maintenance crews break area coffee maker and small fridge inside. Set boxes up like furniture with foam insulation as padding. I left the company probably 12 years ago and when I went back to visit a year or two ago it was still up.