I mentioned the "zone" just now. Dont know exactly where the term came from but the first time I heard of it was at
Joel on Software. We all know that knowledge workers work best by getting into "flow", also known as being "in the zone", where they are fully concentrated on their work and fully tuned out of their environment. They lose track of time and produce great stuff through absolute concentration. This is when they get all of their productive work done. Writers, programmers, scientists, and even basketball players will tell you about being in the zone. The rest of that article at
Joel on Software.