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Fibonacci Day
"Knock
Knock
Knock knock
Knock knock knock
Knock knock knock knock knock!"
"Who's there?"
"Fibonacci"
~ Fibonacci Sequence Mathematician Humour
Add a splash of mathematical flair to your tartan collection! Fibonacci Day, celebrated on November 23rd, is one of the year’s most fascinating and fun dates, inspired by mathematics. The date itself—1, 1, 2, 3—mirrors the opening digits of the famous Fibonacci sequence, a recursive series where each number is the sum of the two preceding it. This tartan design draws from the first eight numbers of the sequence: 0, 1, 1, 2, 3, 5, 8, 13. The sequence is named for the Italian mathematician Fibonacci, also known as Leonardo Bonacci (1175–1250), who popularized it through a theoretical study of rabbit population growth under ideal conditions. Interestingly, Fibonacci wasn’t the first to describe the sequence—it was first recorded by 6th-century Indian mathematicians. Fibonacci numbers have a natural beauty, frequently appearing in patterns across nature, from sunflower spirals to pinecone bracts. They reveal the hidden order behind life's intricate designs, making this tartan with its colourful Fibonacci sett not just a nod to mathematics but to the wonders of the natural world! ❤️ 💙 💚 🤍 1️⃣ 1️⃣ 2️⃣ 3️⃣ 5️⃣ 🐇🐇🐇🐇🐇
Fibonacci Day is celebrated November 23, using month-first notation 1-1-2-3, 11/23, based on the Fibonacci series begining 1, 1, 2, 3, 5, 8, ... a pattern of counting where each number is the sum of the previous two.
Fibonacci Day recognises the importance and value of Italian mathematician Leonardo Fibonacci’s contributions to mathematics and the prevalance of mathematics in the natural world.
By designer Chris Sanyk, the pattern and colour of stitches in the tartan were chosen based on both the sequence and the colours of the Italian flag.
Leonardo of Pisa, sometimes known as Leonardo Fibonacci did not actually invent or discover the Fibonacci sequence (which first appears in Indian mathematics in connection with Sanskirt prosody), but he used it as an example in his book, Liber Abaci, when studying the idealized population growth of rabbits.
Fibonacci sequences appear in many biological settings - the branching in trees, the arrangement of leaves on a stem, the fruitlets of a pineapple, the flowering of artichoke, the uncurling of a fern, the arrangement of seeds in a pine cone, and much more.
Though indeed favored by nature and with interesting mathematical properties, the Fibonacci sequence and its mathematical cousin (Phi, the "golden ratio") do not appear as widely as some have alleged, claiming their mysterious presence in art, architecture, human body proportions, etc ... . The purportedly ubiquitous nature of these "celebrity numbers" appears to be a bit of wishful "number gossip" generated by ardent, but not rigorously mathematical pattern seekers, and patiently debunked by mathematicians!
For more on the Fibonacci sequence in nature, click the collage!