I once saw a middle school art teacher do a clay project where the students made something that would have water in it - ie a pool, cup.... and they melted blue glass to make the water. This intrigued me, as I never thought about trying to melt glass in the kiln before. The concept seems simple enough.
So this year a couple of the elementary schools in my district began to experiment with this idea. I had some left over clay from this year and thought 'why not give it a try'. So I explained to the students that we were going to do our own art room experiment. I told them the plan and what hopefully would happen - but we would have no idea until we tried it.
Of course the kids were excited about not only the experiment but working with clay AGAIN! So, I drug out all the clay materials, demonstrated how to make a pinch pot, bisque fired the bowls, glazed them, each student picked out one half marble (the marbles that are flat on one side - used for vases of flowers) and fired them again.
The results are great! I can't wait to give them to the kiddos. Most of the marbles melted completely - some of them had a bubble that popped and left an optical illusion of a bubble. They are magnificent!