To avoid doing actual productive work at the computer this afternoon, I took an old yellowing list of numbers I had created from our "measuring door jamb" in our kitchen to make the graph below for my sons. Much to their annoyance, I would pester them to stand up straight against the white-painted woodwork and mark their height with the date. When we redecorated the kitchen a few years ago, I had the uncharacteristic foresight to record the marks before painting over them.
This is how engineers communicate with engineer offspring.
[Click to embiggen]