Yes, glass is a very interesting medium to work with. I took a couple of marble making classes where the instructor just piled everyone's marbles into the kiln without keeping track of who put what where. So it was always frustrating to figure out who owned each marble. Since none of us in the class worked with glass ever, we had no clue as to what the glass colors would be once they were heated and cooled. So what I thought would be a beautiful red marble turned out to be almost colorless because apparently I heated it up too much. I gave up on taking those classes. I figured, leave it to the experts and I'll just keep hunting for jars and stuff. Glasswork is an art to be respected. But, it was an interesting experience. New found appreciation, that's for sure.