metaphysical lay-line

I thought i'd get round to snapping these things that I see every day during my job. Interesting to see them close up as they are only about 10 millimeters tall and above head-height.

Anyway enough mystery: they run in strips along the top of a garden fence I can only guess they're some kind of cat-friendly deterrent or squirrel-friendly as opposed to using barbed wire. Otherwise they're to prevent birds from roosting on the fence and crapping.

btw I really love crows as they seem to be a crazy sort of bird.

Thankfully I'm near the end of my work when this photo is taken and as a bonus 3 days off work from tomorrow..and no working it overtime whoohoo!