Poster for annual celebration of Fibonacci Day (November 23) with Fibonacci spiral and Fibonacci numbers (Fibonacci sequence) premium vector by Ravennka

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vector number curve shape celebration day holiday art celebrate gold beauty nature golden retro formula banner balance education spiral special geometric science ancient section unique geometry harmony radial november theory poster mathematics Pisa radius sequence annual divine ratio fibonacci ration proportion leonardo 23 eps10 pisano bonacci fibonacci day liber abaci

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