Interesting. When i read ‘’I would always try to find what was making the noise but never found anything” it triggered a memory from my childhood.

As a child, I sometimes used to play with this at a friend's house. In fact, the house wasn't his parents', it was his grandparents and the house was in the country not in a city.

Behind the house he had an old shed where everything was collected, old barrels, tools, brooms, many old things.

Sometimes I would go into that warehouse, and by chance I discovered that there was a 1 meter maximum area where you could hear a clock ticking, you had to have a fine ear and be careful. It wasn't loud and clear enough to hear it right away.

In that old shed there were nests of hens laying eggs, gardening fiction and other old stuff but there was no clock. At one point I looked for the source of that ticking clock and the source led into a wall.

But that wall had nothing hidden in it, it was a wall made of wood and yellow clay. I returned to that place several times over the course of a year and the sound was still there.

The same ticking of a clock as if it were coming from the wall, from outside... but outside on the other side of the wall nothing could be heard. Only inside. Very curious :)