Back of a typical 1915 terra cotta architectural sculpture (keystone) showing the internal structural webbing and hand-holds.
Visible in the larger version are the marks on the webbing walls left by the fingers of the worker who pressed the original clay.
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Back of a typical terra cotta architectural sculpture (keystone) showing the internal structural webbing and hand-holds. SOURCE: Randall's Lost New York City http://www.lostnewyorkcity.com