{"id":17388,"date":"2025-06-20T15:38:06","date_gmt":"2025-06-20T13:38:06","guid":{"rendered":"https:\/\/gauthiercerf.com\/?p=17388"},"modified":"2025-10-03T20:30:02","modified_gmt":"2025-10-03T18:30:02","slug":"on-the-trail-of-leonardo-fibonacci","status":"publish","type":"post","link":"https:\/\/gauthiercerf.com\/en\/on-the-trail-of-leonardo-fibonacci\/","title":{"rendered":"On the trail of Leonardo Fibonacci"},"content":{"rendered":"\t\t
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Fibonacci - his life, his work and his statue<\/h2>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/section>\n\t\t\t\t
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Fibonacci statue by Giovanni Paganucci<\/em>
Foto: \u00a9 Copyright 2025, Gauthier Cerf.<\/p>\n\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/div>\n\t\t\t\t

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\n\t\t\t\t\t\t\t\t\tThe person who gave the Fibonacci series its name is Leonardo Bonacci<\/em>, also known as Leonardo da Pisa<\/em>, or Leonardo Pisano<\/em>. He lived in Pisa around 1170 \u2013 1241 and became known as Fibonacci, an Italian short form of Figlio di Bonaccio (engl. \u2018son of Bonaccio\u2019). His father was Guglielmo Bonacci<\/em>, who was responsible for a trading centre in Bugia, Algeria.

Leonardo often accompanied his father on trips to North Africa and was trained in the Hindu-Arabic numbering system, which was far superior to the Roman numbering system of the time because it allowed much faster calculations. This was of course a great advantage for traders.

Fibonacci’s involvement with Arabic mathematics made him one of the great mathematicians of the Middle Ages. He brought the Hindu-Arabic numbering system to Europe with his book Liber Abaci, published in 1202. In it, he also calculated the reproduction of pairs of rabbits whose population grows in the Fibonacci sequence.\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/section>\n\t\t\t\t
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\n\t\t\t\t\t\t\t\t\tThe picture on the right shows the page of the book Liber Abaci<\/em>, in which Fibonacci shows the first numbers of his sequence from 1 to 377 in the right-hand margin.

In the 1220s, Fibonacci wrote three further mathematical works that are still known today: Practica Geometriae<\/em>, Liber Quadratorum<\/em>\u00a0and Flos<\/em>.

Unfortunately, little is known about Fibonacci beyond these works and after his death. It was not until the 18th and 19th centuries that his works were rediscovered and a complete edition was printed.

The return to Fibonacci’s significant achievements led to the government in Florence commissioning a statue in his honour. The commission was awarded to the Florentine sculptor Giovanni Paganucci, who completed the statue in 1863.

Unfortunately, there are no known images of Fibonacci during his lifetime. The statue and other images of Fibonacci are therefore fiction.

The Fibonacci statue stood then and still stands today in Pisa’s historic cemetery in the impressive Campo Santo building. Alongside the Duomo di Pisa, the bell tower of the cathedral (Il Campanile, known to most as the Leaning Tower of Pisa) and the Baptistery (Il Battistero), this is one of the four marvellous historical buildings in Piazza del Miracoli in Pisa.\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/div>\n\t\t\t\t
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Page from the book Liber Abaci<\/em> by Fibonacci
Photo: Public Domain, https:\/\/commons.wikimedia.org\/w\/index.php?curid=720501<\/p>\n\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/section>\n\t\t\t\t

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Construction work on the Campanile began in 1172, around the year Fibonacci was born. However, Fibonacci did not live to see its completion, as it took around 200 years due to frequent interruptions in construction caused by wars and a shortage of money. However, he must have seen the leaning of the tower as a boy, as the tower began to tilt as early as 1178 due to poor design and inadequate foundations on unstable ground.<\/p>\n\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/section>\n\t\t\t\t

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Photo: \u00a9 Copyright 2025, Gauthier Cerf.<\/p>\n\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t

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The Piazza dei Miracoli<\/em> in Pisa with the Battistero<\/em> in the foreground, the Campo Santo<\/em> on the left and the Duomo di Pisa<\/em> on the right. The imposing 11-metre bronze statue \u2018Arcturus e Sun – I Cavalli Volante<\/em>\u2019 (the flying horses) by the Pisan artist Antonio Signorini<\/em> can be seen at the very front.<\/p>\n\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/div>\n\t\t\t\t

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Photo: \u00a9 Copyright 2025, Gauthier Cerf.<\/p>\n\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t

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The inner courtyard of the Campo Santo<\/em>, where the statue of Fibonacci stands, among others.<\/p>\n\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/section>\n\t\t\t\t

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Photo-Galerie of the Fibonacci statue<\/h2>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t
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Some impressions from inside the Campo Santo with the Fibonacci statue<\/p>\n\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t

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Photo: \u00a9 Copyright 2025, Gauthier Cerf. All rights reserved.<\/p>\n\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/section>\n\t\t\t\t<\/div>\n\t\t","protected":false},"excerpt":{"rendered":"

Following the trail of Fibonacci brought me to Pisa, his birthplace in Tuscany, Italy.<\/p>\n","protected":false},"author":7,"featured_media":17248,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"footnotes":""},"categories":[4],"tags":[],"class_list":["post-17388","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-uncategorized"],"acf":[],"yoast_head":"\nOn the trail of Leonardo Fibonacci - Gauthier Cerf Art<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/gauthiercerf.com\/en\/on-the-trail-of-leonardo-fibonacci\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"On the trail of Leonardo Fibonacci - Gauthier Cerf Art\" \/>\n<meta property=\"og:description\" content=\"Following the trail of Fibonacci brought me to Pisa, his birthplace in Tuscany, Italy.\" \/>\n<meta property=\"og:url\" content=\"https:\/\/gauthiercerf.com\/en\/on-the-trail-of-leonardo-fibonacci\/\" \/>\n<meta property=\"og:site_name\" content=\"Gauthier Cerf Art\" \/>\n<meta property=\"article:published_time\" content=\"2025-06-20T13:38:06+00:00\" \/>\n<meta property=\"article:modified_time\" content=\"2025-10-03T18:30:02+00:00\" \/>\n<meta property=\"og:image\" content=\"https:\/\/gauthiercerf.com\/wp-content\/uploads\/2025\/06\/Fibonacci-Statue-Widmungstafel-scaled.jpg\" \/>\n\t<meta property=\"og:image:width\" content=\"2560\" \/>\n\t<meta property=\"og:image:height\" content=\"1920\" \/>\n\t<meta property=\"og:image:type\" content=\"image\/jpeg\" \/>\n<meta name=\"author\" content=\"Walter H\u00fcrsch\" \/>\n<meta name=\"twitter:card\" content=\"summary_large_image\" \/>\n<meta name=\"twitter:label1\" content=\"Written by\" \/>\n\t<meta name=\"twitter:data1\" content=\"Walter H\u00fcrsch\" \/>\n\t<meta name=\"twitter:label2\" content=\"Est. reading time\" \/>\n\t<meta name=\"twitter:data2\" content=\"5 minutes\" \/>\n<script type=\"application\/ld+json\" class=\"yoast-schema-graph\">{\"@context\":\"https:\\\/\\\/schema.org\",\"@graph\":[{\"@type\":\"Article\",\"@id\":\"https:\\\/\\\/gauthiercerf.com\\\/en\\\/on-the-trail-of-leonardo-fibonacci\\\/#article\",\"isPartOf\":{\"@id\":\"https:\\\/\\\/gauthiercerf.com\\\/en\\\/on-the-trail-of-leonardo-fibonacci\\\/\"},\"author\":{\"name\":\"Walter H\u00fcrsch\",\"@id\":\"https:\\\/\\\/gauthiercerf.com\\\/en\\\/#\\\/schema\\\/person\\\/151242fd769b50f1ee0bbe82f5fa98e7\"},\"headline\":\"On the trail of Leonardo Fibonacci\",\"datePublished\":\"2025-06-20T13:38:06+00:00\",\"dateModified\":\"2025-10-03T18:30:02+00:00\",\"mainEntityOfPage\":{\"@id\":\"https:\\\/\\\/gauthiercerf.com\\\/en\\\/on-the-trail-of-leonardo-fibonacci\\\/\"},\"wordCount\":567,\"publisher\":{\"@id\":\"https:\\\/\\\/gauthiercerf.com\\\/en\\\/#organization\"},\"image\":{\"@id\":\"https:\\\/\\\/gauthiercerf.com\\\/en\\\/on-the-trail-of-leonardo-fibonacci\\\/#primaryimage\"},\"thumbnailUrl\":\"https:\\\/\\\/gauthiercerf.com\\\/wp-content\\\/uploads\\\/2025\\\/06\\\/Fibonacci-Statue-Widmungstafel-scaled.jpg\",\"inLanguage\":\"en-US\"},{\"@type\":\"WebPage\",\"@id\":\"https:\\\/\\\/gauthiercerf.com\\\/en\\\/on-the-trail-of-leonardo-fibonacci\\\/\",\"url\":\"https:\\\/\\\/gauthiercerf.com\\\/en\\\/on-the-trail-of-leonardo-fibonacci\\\/\",\"name\":\"On the trail of Leonardo Fibonacci - 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