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The Golden Ratio (why it is so irrational) - Numberphile

Numberphile · 3.9M views · 2018-05-08 · 15:13

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Overview

Numberphile's Ben Sparks shows why the golden ratio is the most irrational number, using seeds, continued fractions and rational approximations. He also explains why plants use it for spacing leaves and seeds.

On Hacker News

HN calls it illuminating for explaining why phi is the most irrational number, relevant to hashing, spirals and phyllotaxis.

Recommended by 3 HN people across 4 months · HN mentions 2018–2026

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What people said

jazzyjackson · 2022-04 · Strong recommendation

a mind-rewiring video by numberphile concerning the golden ratio [0] made sense of all the spiral overlay art: yes, plants use it because it is an optimal solution for minimizing overlap when sprouting leaves during growth, maximizing spatial coverage but also, as a number that is least able to be approximated by rational, erm, ratios - it is a pattern that most closely approximates random patterns. So more than any other spiral, a fibonacci spiral has the highest likelihood of overlapping random points in 2D space... (and fibonacci series converges on the golden ratio because they are equivelent expressions of the continued fraction 1+(1/(1+(1/(1+(1/(1+(1/... [0] [VIDEO]

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jazzyjackson · 2021-11 · Strong recommendation

Golden ratio is not arbitrary, it solves the problem: How to make sure nothing lines up. This link gets passed around a lot and it's very illuminating, demonstrating that the golden ratio is objectively "the most irrational number": [VIDEO]

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glkindlmann · 2026-01 · Recommendation

I learned about this not from Mathologer, but Numberphile [1]. The second half of the video is the continued fraction derivation. I remember this being the first time I appreciated the sense in which the phi was the most irrational number, which otherwise seemed like just a click-bait-y idea. But you've found an earlier (9 years ago vs 7) Mathologer video on the same topic. [1] [VIDEO]

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Video by Numberphile, played through YouTube.

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