Shimelle's Photo Challenge - Manmade

Of course, being at a war museum, practically everything was manmade! I had so much to choose from, but my favourite is this one:

So, what is it? Well, it is manmade in two ways. Firstly, it is, or was, four glass bowls, which were obviously manmade. What makes them manmade a second time, is that they were fused together by the heat from the atomic explosion at Hiroshima on 6th August 1945. It really made you stop and think.