Origami safe, complete with fully functional direct-entry fence
combination lock. Much easier to build (if a lot less shiny) than your average bit of security demo hardware, it fulfills more the intellectual role of the ‘giant locks’ seen at trade shows and occasionally machined on a smaller scale by hobbyists.
Reminds me in a not-so-good way of a certain Pickens Selfstorage facility in Berlin. (they look great at first glance…) Pro tip: avoid.