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Artists , hardened on the frontlines of the Pacific war , brought a considerable degree of realism to their drawing . Students suggested that future ads might include pregnant teenagers or teen mothers , as they would lend a sense of realism to the ad . ( 1864 ) , and many other writers used the assumptions of realism to lend greater corporeality to invented worlds . Thanks to his real-life experience on cattle drives , Hart brought a strong sense of realism to his movies .