Re-Calculation...

Does anyone kick small stones along the path as you walk?

You see a stone about 5 metres in front of you and you go to kick it with one foot you really need to get the other foot to land just beside it to give you maximum leverage on the kick.

If your feet aren't going to get to the stone at the right position, do you find yourself re-adjusting your stride several steps in advance to get the optimum position?

Aren't brains cool?

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Notes on the Picture...
I passed this in Edinburgh today on my way to alternate workplace and have never noticed it before. Unfortunately didn't really have time to stop and examine but does anyone else know where it is or even what it is?