Four Mile Rock (also Fourmile Rock) is a round granite erratic, approximately 20 feet (6.1 m) across, in the intertidal zone below Seattle’s Magnolia Bluff and 60 yards offshore.
https://github.com/davepinch/pinchy.cc/blob/master/content/topics/places/glacial-erratics/erratics/four-mile-rock/four-mile-rock.md
Besides this, the habit which they will acquire, by seeking first what is easy, and then passing onward slowly and step by step to the more difficult, will benefit them more than all my instructions.