Its the "golden ratio", its everywhere. Its the ratio of your body parts, (eg. Your hip to ground x 1.618033=your hight). Its in nature (flowers, bugs), its in your DNA. Its the perfect ractangle. Its the optimal angle of a window for maximum enterence of light. Its in the fibbonachi sequence after you get to about 13th number of the fibonachi sequence take that number and devide it by the one before it (it works until infinity.)