https://www.tclf.org/places/city-and-regional-guides/chicago
https://en.m.wikipedia.org/wiki/List_of_public_art_in_Chicago
https://webapps1.chicago.gov/landmarksweb/web/landmarkdetails.htm?lanId=1323
http://chicagoloopbridges.com/bridges12/MS12/COL12-1.html
Thumb & Four Fingers 