Obsessive design: Finnish speed badges

According to the Finnish law, vehicles in classes M2 and M3 are required to carry a so-called "100 km/h speed badge". This badge is a round sticker with a yellow background and a black number 100. Nothing special there. The regulation is, however, rather ambiguous on how the badge should look, which of course means that we have a medium through which we can express ourselves.

One day, on my way to work I saw one of these badges on a bus. I'd never really paid close attention to these badges before but this, somehow, managed to catch my eye. It occurred to me that this badge is actually quite an interesting manifestation of our obsession with visual symmetry.

This is the badge I'm referring to:

I realized that it would take some visual trickery to make the upper and lower right "corners" of the second 0 and the upper and lower left "corners" of the 1 to sit equally far away from the edges of the circle but it still took me a while to understand how this effect was achieved. Here's what's going on:

• The second 0 is warped (the top is slightly shifted to the right)
• The 1 sits just a tiny bit below the baseline to give it more space on the left
• The yellow background might not be perfectly round (thickness of the black edge varies a bit - this could be caused by the viewing angle in this particular photo)

I'm almost certain that the person who penned this badge was never explicitly told to strive for symmetry. I'm also quite sure the poor guy never got paid any extra for going the extra mile. Pretty irrational, right? I guess that's what obsessions are - irrational.