I made a lot of pit-fired objects while at Rubys Clay Studio in San Francisco. A group of us would start our day at dawn at Ocean Beach, dig a pit, bury our unfired pottery using sawdust and leaves, and then covered the pit with a sheet of metal. Periodically we would sprinkie metal oxides and salt into the pit. The rest of the afternoon was relaxation and fun at the ocean until our fire simmered out, signifying our work had been sufficiently cooked. And then we would wait for cooling of the ambers, so we could carefully dig out our buried treasures, The transformations were always stunningly unpredicatable.