good idea ... reminds me of the distinction between "recreation" as wasting time, versus "recreation" as re-creation, renewing internal energy ... good remarks on that theme by Steven Covey in Seven Habits of Highly Effective People, as summarized on http://www.dmreview.com/article_sub.cfm?articleId=1016324:

Habit 7 is about taking care of the most important resource you have - yourself. This habit is a quadrant II activity that I call "re-creation" - not just "recreation" of play or frenetic vacation as an interlude to work, but as time and activity that truly rejuvenates us. These re-creation activities are important, but rarely urgent until we become ill and must address it. Habit 7 is about increasing your PC (production capability) by taking care of yourself.

Also reminiscent of the excellent advice in the 1907 book The Use of the Margin by Edward Howard Griggs, wherein he describes two great "open secrets": concentration and variety in intellectual activity --- focus on one thing intensely, and then when tired rest not by passive inactivity but rather by shifting the focus to something else ...

- ^z -