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https://hackaday.com/tag/harmonograph/
Harmonograph | Hackaday
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https://blog.ted.com/the-harmonograph-swingset-capturing-the-frequency-of-love-and-friendship/
A Harmonograph Swingset, capturing the frequencies of love, friendship | TED Blog
If a meet-cute is going to happen at TED2015, it will likely happen downstairs on the first level at the Harmonograph Swingset.
the frequenciesof loveharmonographswingsetcapturing