A spanner in the works

Interesting discovery on the Bristol to Bath cyclepath today on our long walk.
This little guy accompanies a poem by Ben Okri about roads.
Led me to read more about him...

http://www.independent.co.uk/life-style/interview-ben-okris-greenapple-lefthanded-sort-of-day-a-writers-magic-journey-from-living-rough-to-trinity-cambridge-1499377.html