I came upon the blog http://glazetectonics.blogspot.com/ Glaze tectonics! Great name. Take a gander through all the macro shots from the blog, such as those displayed below! The ceramic surface really is a landscape of sorts. Just imagine what is involved in creating any of these surfaces a little… copper, manganese, alumina, silicon carbide, tin, volcanic ash, barium?- anything is possible for such a volatile surface. Now contemplate what it takes to make a lush perfect fitting glaze, it really could be the same materials! This is what I mean where I say there are endless possibilities. There are a finite amount of materials and endless combinations and firing environments.