sentences:  During this massive undertaking, a crucial role fell to designers perceived not as merely architects creating streets and edifices, but rather as "engineers of the human soul".The idea extended beyond aesthetics and into principles of urban design meant to express grandiose expectations and arouse feelings of stability and political power monopoly in Stalinist Poland.Since the style of the Renaissance was generally regarded as the most revered in old Polish architecture, it was to become Poland's socialist national format.