They surface in richest abundance late in autumn. Ocean storms roil the coast, dredging up fragments of history and sweeping them onto the beaches: mysterious shards of sea-tumbled pottery, porcelain, and china, each richly detailed and unique. Polished over decades by the same ocean currents that produce sea glass, sea pottery shards offer beachcombers a connection to the past, like tiny messages in bottles from the deep. By studying their shape, color, and decorative details, the most experienced scavengers can trace some fragments back to their origins in past centuries. "It's the romance o...