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By one of the strange coincidences of history, the 5th century BC produces the first masterpieces in two incompatible styles of sculpture.Nearly 2500 years later, these styles become bitter rivals in the studios of our own time.They are seven heads, found at Lydenburg in the Transvaal.Modelled in a brutally chunky style, they date from about the 6th century AD.Cast metal is the only other material to withstand the continent's termites (fatal to the carved wood of most African sculpture).But the superb metal sculptures of Nigeria, beginning in about the 12th century, are of a much later period than the first terracottas.