Sometimes during home development you can get a situation where you think 'oh no, now it's all messed up'. This messed up bit can be a little gem. However, I do believe this was done intentionally... Little footsteps like this can be something you'll treasure for years to come as your kids grow up so fast. And by painting a little space on the wall with chalkboard paint you create a little corner for your young one to really get creative.
