The curious case of the bottles in the walls

As I cycle around Puglia in southern Italy I keep seeing them. At first I thought that they were just a drunken prank, litter, or even fly tipping. But no, someone has carefully placed plastic bottles tucked neatly into the insides of the stone walls.

Wall bottles - The Hall of Einar - photograph (c) David Bailey (not the)

On some walls, the concrete ones, there are regular circular holes and there I saw glass bottles perched upright in them. Here they are plastic bottles.

What can they possibly be for? I look inside one hoping for an answer. There’s something in there but I don’t know what it is? Are they wasp killers? To ward off evil spirits or just vases for summer cut flowers?

Wall bottles - The Hall of Einar - photograph (c) David Bailey (not the)

I have no idea.

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