ProPil Pop Quiz #10

Oof. It's Friday, but September 11th always weighs heavy. I haven't reminded Sue what day it is. That would put her in a bad mood. Supposed to be a rainy one.

She started painting the stairwell last night. Looking good. I've installed about 90% of the flooring in the basement. We'll share pics next week.

ProPil Pop Quiz #10
In this picture from earlier in the week, you'll notice there's a small rectangle removed from a sheet of plywood. (Look upper left.)


That small rectangle was removed from the board over the weekend, and it is being put to very good use. What is it being used for?

Here's your hint: No visitor to the house has ever seen this old wallpaper.


It's a tough one, but you guys are supa smaht.

PS
Maybe this will help get you guys through the day. This dude is totally ridiculous. Totally. You will not believe your eyes.