Tiny, Perfect Staircases Made by French Woodworkers
I remember seeing full-scale versions of these in actual houses long ago.<p>Man technology has advanced for the better. These things are brittle, require regular maintenance, they are tiny in width (try getting a fridge up a few floors), ... This actually used to be a pluspoint: when maintenance is lacking, specific portions will deteriorate : so walking upon them there will be a circular fault, which your leg will sink into (as opposed to the whole staircase collapsing entirely). The thing is, this happened to someone I knew on a yearly basis. It can only be fixed by replacing the whole thing.<p>And of course, these were actually put into houses sometimes 5 floors high. Exercise !