Painted stones

This is a thing...
There are various variants of the stones, which are often painted with POSCA or similar pens and sometimes varnished as well.
Not everyone is pleased with the 'trend' but others like the idea that they are encouraging (young) people to look closely, and explore an area.

A little like a stony low-tech version of Pokemon Go perhaps...

What are your views on this? A harmless bit of fun, or 'litholitter'? 

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