A Construction is a special kind of structure that is, in fact, part vehicle and part building. The first such construction was the steel cage as a somewhat experimental location. Since then, more constructions have been created and are listed below.
Constructions cannot move, but they appear like a vehicle in all other respects. They have their own category on the Buildings & Vehicles page, along with Animals, Vehicles, Ships, and Other Rooms. You can see and interact with people inside them, and those people can see and interact with other people outside.
While some constructions can be locked (such as the aforementioned steel cage) most constructions cannot be locked, such as the simple hide tent.