An apparent pattern that breaks, and the reason behind it.
Summer of math exposition: [ Ссылка ]
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An equally valuable form of support is to simply share the videos.

For the long-time viewers among you, if this sounds familiar, it's because it's a remake of one of the earliest videos on the channel. It's such a wonderful problem, and the audio/pacing in earlier videos was really suboptimal, so I wanted to freshen it up a little here.

Timestamps
0:00 - The pattern
2:20 - Counting chords
4:03 - Counting intersection points
6:20 - Euler's characteristic formula
11:30 - Connection with Pascal's triangle
15:10 - Reflections

Correction at 8:56 - The number of the regions should of course be (1, 2, 3, 4, 5), instead of (0,1,2,3,5)

Thanks to these viewers for their contributions to translations
Arabic: mouhsiiin
French: Jonhfing
Hebrew: Omer Tuchfeld
Hungarian: Fabó Bence
Russian: fedor
Spanish: Paweł Cesar Sanjuan Szklarz
Thai: @korakot

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These animations are largely made using a custom python library, manim. See the FAQ comments here:
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You can find code for specific videos and projects here:
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Music by Vincent Rubinetti.
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Download the music on Bandcamp:
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Stream the music on Spotify:
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3blue1brown is a channel about animating math, in all senses of the word animate. And you know the drill with YouTube, if you want to stay posted on new videos, subscribe: [ Ссылка ]

Various social media stuffs:
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