Just some raw footage of a standing wave on a string.
At certain frequencies you set up standing waves. The wave traveling away from the speaker in the lower right corner interacts with its own reflection coming from the other end of the string.
I picked a combination of length and tension to get a fundamental frequency of about 15 Hz.
The harmonics show up at integer multiples of 15 Hz: 15 Hz, 30 Hz, 45 Hz, etc. Its tough to get the fundamental to be precisely 15 Hz, so the harmonics aren't exactly at these values, but you can see they are close.
The perspective here makes it look like the antinodes (big parts of the loop) are different sizes. In reality, they are all the same size when you hit a harmonic. The second harmonic has two equal sized loops. The third has three, etc.
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