How did this pattern sequence? The tide line is in the bottom left, yet the end of the crab’s (?) trail seems to be washed out with its trail still pronounced. The creature is missing, with no other footsteps around other than mine. I love this still life, because it presents a puzzle.
Tide Line Still Life 
Mr. Crab started at top right and wandered down, as he got nearer the tide line the sand was wetter so while it’s legs/claws got deeper the wetter sand recovered more easily to it’s a original position – walking wet sand leaves a far shallower footprint.
Stephen, thank you! I am delighted that you took the time to help me puzzle this out!