This is really cool, very unusual. Didn't recognize the natural Elements - they aren't placed together on the site for some reason - but it's really a set, I guess. Ordered Fire first, then saw the others and got Air, Water, Earth, Space. I think I'll scatter them around a little bit, not group them in one place on the wall. They're solid metal with little shell windows. Easy to hang. Very happy. I'll put this review on all the others as well.