I had a sudden recollection of a happy summer when I was about 11. I grew up on the edge of Milton Keynes and spent a lot of time roaming the nearby fields with friends. We climbed trees. We build dens. We named everything. We ate corned beef sandwiches and loved them. And we paddled in the stream and built dams. I particularly remember squelching about in the mud at the edge and the lovely feeling of it squishing up through your toes.
So the title is in memory of childhood fun and the importance of mud.