A falling tide on the hard sand of Tenby Norrth beach allows each wave to leave a trace of its own margin, made by a little outline trace of sand. Many of these lines interweave as following waves partially cover them. I love the delicate patterns this creates. I left my feet in a few of the images to give an idea of scale. Other marks give that away too! Of course, a rising tide washes all but the highest wave margins away.