When do you paint over a ‘tall wall’? You know that wall where you measure your kids? Where you use a pencil or pen to do the unthinkable: write on the wall! But this is permissible, because it’s not graffiti, it’s data. It’s how you mark your child has grown over time. Sometimes you measure yourself there for fun, and to watch your child gain centimetres as gravity and age take yours. Tall walls are messy. They are part of the story of your home.