The concentric rings, carved on random stone slabs, echo the ripples formed as drops fall from the fountain.  This morning the shallow indentations were filled with water from last night’s rain, catching the low light.  This unobtrusive installation, recently arrived in the garden of the Palais Royal, is part of an exhibition of work by Thierry Courtadon, entitled Une Pierre dans mon Jardin, which is due to open next week.  Coming across the sculpture by chance, with no labels or explanation, was an unexpected pleasure.