This is a very simple rocket stove that I am experimenting with. I wanted to have something to use in case the electricity went out as my home is all electric. I do have a propane barbeque but this is thrifty because it uses bamboo I grow and trimmings from the trees I've planted. The four bricks on the bottom are only as a base. The stove itself is one cement block with part of the center knocked out. I added rocks in the bottom. You add a half block on top as the chimney unit. Put a little paper in the hole and stick small pieces of wood trimmings in the hole and light. It cooks, you just have to keep feeding it small sticks.