Resolving the first of a new series always feels like an important moment, and so it was with this. The initial studies were done on site a few years ago, after quite a scramble across boulders along the shoreline at Welcombe Mouth, on an extra low spring tide. This wonderful arch pierces a tall, narrow stack, which stands at the southern end of the bay. The strata are almost vertical, and from the land they resemble a wave at the point of breaking, massive blocks suspended, on the verge of peeling off like froth. The patch of sand was revealed for barely twenty minutes before the sea reclaimed it.