I've been looking into brick oven design, and I keep running across the figure "62%" as a ratio of one dimension to another. It took me a while to figure out that what I'm actually running across is the golden ratio.
The opening to a brick oven should be 62% the height of the chamber in order for the oven to breathe correctly. The opening should also be 62% the width of the chamber, again in order for the oven to breathe correctly. The height of the chamber should be 62% of the width of the chamber. Over and over again, 62%.
Why 62%? The Golden Ratio.
http://en.wikipedia.org/wiki/Golden_ratio
1:1.618.
The ratio calculates out to 0.6180, which rounds off to 0.62, or 62%.
And this doesn't seem to be an arbitrary application of classical mathematics, but something that's been worked out over thousands of years of the use of brick ovens or their earthen cousins.
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