Rands In Repose has a charmingly written guide to nerds called The Nerd Handbook. It had me chuckling for the whole tram journey this morning. I feel sorry for my wife sometimes.
Your nerd has built himself a cave. I’ve written about The Cave elsewhere, but here are the basics. The Cave is designed to allow your nerd to do his favorite thing, which is working on the project. If you want to understand your nerd, stare long and hard at his Cave. How does he have it arranged? When does he tend to go there? How long does he stay?
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The Cave is also frustrating you because your impression is that it’s your nerd’s way of checking out, and you are, unfortunately, completely correct. A correctly designed Cave removes your nerd from the physical world and plants him firmly in a virtual one complete with all the toys he needs.