Likewise. The way the document icon evolved (http://www.digibarn.com/collections/screenshots/xerox-star-8...) is impressive. Seven iterations and the result is so good we're still using that icon today.
And, as a designer colleague pointed out, look how they thought out how the corners of things would interact with 50% dot fill: http://www.digibarn.com/collections/screenshots/xerox-star-8...
At times, the guy who came up with these ideas infuriated me, but, in hindsight, I am very glad I surrounded myself with such perfectionists.