[Sammi]

Anecdotal evidence: I used to work at a construction materials depot when I was younger. I remember how lost I was when I initially started, I couldn't recognize any of the material sizes by looking at them, while all the old timers always just knew what size they were just by glancing at them. Then only after a couple of months, suddenly I could too. Years later I'm still pretty good at guessing lengths, while people around me seem to always be way off. I can hold out my hands and make a foot, three feet, 1 cm, 0,5 cm 10 cm between them pretty reliably, while other people seem to be way off.