When I was a kid and used to grow vertically I used to stand straight against a wall where my Dad had drawn a vertical line. He’d hold a ruler above my head to mark it with a dash and write the date inspite of my mom’s complaints about not dirtying the wall. So later on I’d get an idea on how much I’d grown over time! (Incidentally, though I was one of the shortest guys almost always standing first in most height-ordered lines 
I did eventually manage to crawl a few inches higher above ground level after some basketball and swimming).
Recently came across an entry in Leonid’s blog which is actually a very cool way of digitally tagging height – all that’s missing is some kind of a timestamp in the picture as well 🙂 (maybe a calendar clock 😉 )
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