Iron is the guest for the earth, because it come from out side. This earth, event the sun, cannot produce iron. Just supernovas sent iron. A supernova is a powerful and luminous stellar explosion.
I use this concept for creating this painting. Melting watercolor effects from iron forms represent ‘the sent down iron’. Gears and machine depict iron. On composition, I added the iron forms in the top side of paper for saying that iron is the guest for the earth.