We bought this house in July. It has an in-ground irrigation system and also a lot of dusk-to-dawn lighting in the landscaping. I haven’t had to use the irrigation system until now and found several sprinkler heads that needed repair when I tested it yesterday. In the process I came across this item underneath some grass that had overgrown it a little bit. I dug around it a little bit to identify it but I can’t seem to figure out what it’s for. Photocells for the lights can be found on each of the lampposts, and it doesn’t seem to be related to the irrigation. Submitted to the brain trust here because the broad range of knowledge never ceases to amaze. What is it?