My senior grandson, now 10, has always been interested in numbers. One of the first books I remember leafing through with him as a kidlet was a hefty mathematical volume his grandfather was reading. His interest was in the page numbers. His tiny fingers sought them out and fixed on them. His presence on my beach walks inspired me to make a collection of beach numbers. He was my co-editor, making his preference for one image over another very clear. None of these images have been tampered with – they are the unaided work of the sea.