Eight year old Sophie and her granddad Clive are creating tiny works of art on stones and hiding them in secret locations around Hertfordshire. People all over the county are having fun finding, photographing and re-hiding the rocks and some have even started designing their own! In this interview, Hanna catches up with Sophie and Clive to find out where they get their inspiration and what tips they have for hiding and finding these special stones. https://www.facebook.com/Harlow-Rocks-1567011380083803/