What you’re looking at:

The map on the left details Tuesday’s primary between Kim Foxx and Anita Alvarez.   The Green/Purple shades are Kim Fox.  The Yellow/Brown shades are Anita Alvarez.

The map on the right outlines 1987’s mayoral election between Harold Washington and Edward Vrdolyak.  The purple shades are Harold.  The red is Vrdolyak.

Maps by Grant Forssberg and The Chicago Democracy Project.