We have a corten steel fire basket and normally it has a brown rust coating. A few days after a pleasant summer evening at the fire basket, I noticed an interesting pattern, on the bottom of the fire basket. A mixture of rust dots, bare steel and soot deposits had created an abstract work of art. This photo is a view of the bottom of the fire basket with the colours digitally changed to shades of blue and turquoise. The original colours were previously brown, yellow and orange with a hint of bare metal. Presumably the heat of the fire along with the presence of charcoal chemically reduced the rusty surface of the bottom of the fire basket to pure iron after which light drizzle in the days after the ashes were removed caused it to start oxidising back. The picture resembles existing abstract paintings and without the above explanation, no one would have a clue what exactly it is.