My brother brought me some more BIG pieces of obsidian from California. I took a spall off of one of them and started working. normally, my attempts at knives either end up as very small arrow heads, or just as a bunch of rubble on the tarp. This time, my thinning flakes did better than normal, and I avoided snapping it. It isn't perfect, but better than most of what I have done lately. I like the way the color changes with the change in light.