Happy stones

It's a school holiday this week. Kids between 4 and 12 can come to the library for a kind of craft bag. Amongst other things there's a bare stone, meant for them to decorate as a happy stone. Colleagues of mine have already decorated stones with images from kids books. Every day we put some stones around the library for kids to find.

In the extra you can see we put a stone near my car. At the end of the day the stone was gone. But surprise: they left another little happy stone!