These three rounded and flattened stones are old Dubai fisherman's weights.
My friend Terry (St Theresa of the Floral Tribute) lived in Dubai for many years, and gave me these beautiful old stones when she came to live here in France.
Originally they were just plain stone; they had never previously grown lichen on their exterior, coral maybe, but not lichen.
I hadn't really looked closely at them for some while, and was amazed to see how beautiful they had become. If lichen really is proof of pure air, then I think we must be in the top league.