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Happersett 's set of beautifully printed , accordion-folded artbooks , Box of Growth , features grid spaces that are filled in with a specific number of strokes per row , where the number is determined by the Fibonacci sequence . In this simulated world , " individual firms grow and perish , there is perpetual adaptation and change at the micro-level , and the composition of each firm at any instant is path-dependent , " Axtell remarked in a preprint describing his model . Sculpted from wooden strips separated by thin aluminum dividers , each panel consists of an array of wells of equal width but different depths . Mathematical elements make significant contributions to the crisp digital sound delivered by an audio CD . " In the sport of orienteering , a competitor uses a detailed map ( and perhaps a compass ) to navigate his or her way across varied terrain following a course drawn on the map .