Cai Guo-Qiang is a very well known Chinese artist, I guess you know his installation Head On. Beside huge installations, he also makes these works with gunpowder. He has a certain amout of control about the outcome of the explosions, but a large part is uncertain. I think this is quite exiting.
These pieces remind me of Rosemarie Fiore, her work is just a little more colorful.
found at colectiva