The apprentice being lower to the ground and slower (sometimes) over the terrain of the Bonsai Mountain is better positioned to notice things like these three curious holes we found as we circumnavigated our back yard. Yours truly is not sure how many times these have been passed unnoticed but now we have seen them an answer needs to be found. Three holes the same size in rock, unknown depth and uncertain purpose. I think it might be something to do with geological sampling, the apprentice thinks its caused by rock mice. Or worms.