 <unk> Kaufmann and True 's work , the Norwegian @-@ born , naturalized American sculptor <unk> <unk> Hansen designed many of the sculptures on and around the dam . His works include the monument of dedication plaza , a plaque to <unk> the workers killed and the bas @-@ reliefs on the elevator towers . In his words , Hansen wanted his work to express " the immutable calm of intellectual resolution , and the enormous power of trained physical strength , equally enthroned in placid triumph of scientific accomplishment " , because " [ t ] he building of Hoover Dam belongs to the <unk> of the daring . " Hansen 's dedication plaza , on the Nevada <unk> , contains a sculpture of two winged figures flanking a flagpole . 
