Then paint in some.
It appears the artist made the windows taller the further to the right as he went. But it turns out that the building's roof is sloping down to the right. An optical illusion that can be solved by looking at the bricks along the roofline.
Each one depicts an owner and their business in Chillicothe of years gone by. There is a service station and cafe, certified public accounts, a couple manufacturing firms, two glove makers, a jewelery store, a market, a grocery store, drug store, a 5th generation farmer, a clinic and a tractor implement manufacturer.
I like the one in the middle of Betty Preston Steele, 31 years of teaching piano, and her music notes drifting out the window.
This is linked to Oakland Daily Photo Monday Mural