Illustration showing succession of golden rectangles that are used to construct the golden spiral. Two quantities are considered to be in the golden ratio if (a+ b)/a = a/b which is represented by the Greek letter phi. Each rectangle shown is subdivided into smaller golden rectangles. The golden spiral is a special type of logarithmic spiral. Each part is similar to smaller and larger parts.
Keywordsrectangles, golden rectangle, golden ratio, golden mean, golden proportion, golden section, extreme ratio, mean ratio, medial section, golden cut, divine section, golden spiral, logarithmic spiral, Fibonacci spirals
Florida Center for Instructional Technology Clipart ETC (Tampa: University of South Florida, 2007)