Two years ago, my family bought land north of the city. Laboring with hand tools quickly proved futile, so we acquired a tractor. The tractor’s job is to push dirt around to flatten the land for a future orchard. The challenge is that the dirt is filled with large rocks, glacial erratic boulders to be precise, so it is hard to push that dirt around. It would be a lot easier if we could grab the boulders from above and pull them up and out of the dirt.