The image is not very clear, but it shows a hand (mine) in bas-relief, cut into a piece of flat stone.
I cut it, and, as I was building a small 'potting shed' at the time, included it in the wall to amuse the children. It became our 'lucky hand', and everytime we needed some good luck, we would place our hands over it, and beseech whatever was required.
One day, before leaving for a trip in my huge, massively over powerful (and thirsty) Rover SDI 3.5 V8 monster, we all touched the hand as usual..... and the wretched car refused to start. Not a whisper!.
We looked into all the usual causes of non-starting, but could find nothing. In my frustration I sold the car to a local scrap yard, and replaced it with a wonderfully simple Renault 4L (the one you could put a calf in the back).
All this happened many years ago, and no-one has since touched the 'lucky hand'. I suppose It really should now be known as the 'unlucky hand'.
I didn't regret getting rid of the crazy Rover, It was too powerful, noisy, and thirsty for the French countryside; the Renault suited me much better.
The hand is still there!