(Photo: Rafael Gamo)
It won't be enough to absentmindedly stroll up and down the stairs. You'll have to think about where you're placing your feet or you'll tumble down. JSa Architecture, a firm in Mexico City and Lima, designed these stairs, although it's not clear why.
-via Contemporist
The might look difficult, but they actually have treads exactly where your feet need and only what you use during a standard right-foot-initiated climb.
Plus, great for thwarting unknowing intruders who enter your home. :P