Furniture design. Swedish designer Fredrik Hyltén-Cavallius has created the Piet fireplace. From the designer: Piet is a chimney free indoor stove with a brass reflector, that burns ethanol fuel instead of wood. This gives no smoke or soot and thereby eliminates the need of a chimney. A layer of rockwool fire insulation between the reflector and the outer shell keeps the outside cool. This means that you ...