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spec: This is known as the arcadian system or arcadian rhythm . " Our understanding of the modern city is positioned between an urban reading and a generalized conception of the " natural , " a utopian , Edenic , or arcadian possibility located within , outside of , or in an undeveloped zone of the city . Many inventor organizations and their inexperienced inventor / leaders do , too . During her first procedure , the descending thoracic and abdominal portions of the aorta were repaired with a synthetic polyester fiber ( Dacron ) . The opening canvas depicting a primitive Savage State , with a hunting scene , is followed by a classical idyll reflecting the Pastoral or Arcadian stage of civilisation . The Alliance acknowledged the modifications to the MAP values in the final rule as an improvement over the values proposed in the NPRM . Alas , that golden and informal , nostalgic and Arcadian era of the Internet is - by and large - gone .