DescriptionThe Spiral Chart (or the Square of Nine).jpg
English: The Spiral Chart (or the Square of Nine) popularised by W. D. Gann. This particular version of the chart is created by Victor Chan Wai-to who has agreed to to irrevocably release this file to Wikimedia Commons under the Creative Commons Attribution-ShareAlike 4.0 license.
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to remix – to adapt the work
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