spacetime curvature grid. recent photographic survey of helmet jahn’s 40th floor conference room, located on the top floor of giaver and dinkelberg’s 40-story jewelers building (1927), located at 35 east wacker drive, chicago, il. a future post will feature images and video of the fully … Continue reading a rare opportunity to carefully document helmet jahn’s postmodern spacetime gridded conference room on top floor of giaver and dinkelberg’s 40-story jewelers building