This is a video of engineer and maker of things The Q building and riding a bike with square wheels. Not the square wheels you’d expect though, instead of rattling all your teeth out of your head when you ride it, the wheels are actually treaded, which allows for an incredibly smooth, albeit relatively loud, ride. It’s like a tank bike! One I wouldn’t recommend trying to ride through a wall, just to be clear.
Keep going for the video, but skip to the last minute if you just want to see the thing in action.