Vista's own website,
www.vistatowerchicago.com, seems embarrassed about the louvers. On this page viewing the building from the northeast, it shows an actual photo:
https://www.vistatowerchicago.com/ne...1-mile-radius/
But on this page viewing the building from the south, it uses renderings:
https://www.vistatowerchicago.com/ne...ty-of-chicago/