Not sure whether duniya gol hai ki nahi but nearly all wells certainly are. Now, why ain't there a well available in any other shape? Or is there? It's like a blindly accepted universal law that a man-made deep hole has to be circular in design. It's a fixed template. Everywhere. But does it really matter to the water beneath? The liquid treasure would rise any which way, wouldn't it? That's plain physics. Maybe the architectural fixation has something to do with the easiness that circumferential digging facilitates. Maybe not. You get to 'cut corners' when you're going round right into earth. Interestingly enough, modern septic tanks are usually rectangular and we don't have an issue with that. Keeping up with this thought, imagine how a square well might look like. Seems good enough. And guess what? You're thinking into the box for a change.