'The Murmuration Waltz' by Peter Conner, Andy Aitchison, a few thousand starlings and some geese.

Take 4m 29s out of your day, put on headphones if you have them and marvel at how countless thousands of starlings can twist and turn together in effortless waves of harmony, creating seemingly pointless but stunningly graceful patterns before settling into the reeds to roost. And all, it seems, without any apparent leader. Makes you think. Hopefully.
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