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</html><thumbnail_url>https://gauthiercerf.com/wp-content/uploads/2025/12/GCA-Session-Fibonacci-Cello-2025111100412_JPEG-WEB_WATERMARKED-e1765545782316.jpg</thumbnail_url><thumbnail_width>2048</thumbnail_width><thumbnail_height>1091</thumbnail_height><description>Concept Fibonacci Circles The Fibonacci Circles collection shows arrangements of circles whose diameter corresponds to the Fibonacci numbers. The diameter of a circle is therefore the sum of the diameters of the next two smaller circles. The colored areas grow as the square of the Fibonacci numbers. Only semicircles are used in the Semi-Circles series. [&hellip;]</description></oembed>
