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I figure if Seymore Cray thought digging was useful for mental hygiene it's probably ok: https://en.wikipedia.org/wiki/Hobby_tunneling https://en.wikipedia.org

• shagie 7mo ago
  https://web.archive.org/web/20080521163217/http://www.time.com/time/magazine/article/0,9171,967095,00.html https://web.archive.org/web/20080521163217/http://www.time.c... > For Cray, the excavation project is more than a simple diversion. "I work when I'm at home," he recently told a visiting scientist. "I work for three hours, and then I get stumped, and I'm not making progress. So I quit, and I go and work in the tunnel. It takes me an hour or so to dig four inches and put in the 4-by-4s. Now, as you can see, I'm up in the Wisconsin woods, and there are elves in the woods. So when they see me leave, they come into my office and solve all the problems I'm having. Then I go back up and work some more." > Rollwagen knows that Cray is only half kidding and that some of the designer's greatest inspirations come when he is digging. Says the chairman: "The real work happens when Seymour is in the tunnel."