This is probably off-topic since it isn't really a question, but I thought that this GIF of the fourier series of a square wave was too cool not to share.
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I know the guy who makes those. He is Brazilian and makes many of the animations you see on wikipedia. – Tarin Ziyaee Aug 13 '13 at 16:58
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There should be some way to edit this DSP visualization into the form of an on-topic question. Anyone? – hotpaw2 Aug 13 '13 at 17:54
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1@hotpaw2 Question: Why is this so pretty? :P – Tarin Ziyaee Aug 13 '13 at 18:23
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epicycles on epicycles! @hotpaw2: or just move it to meta. – endolith Aug 14 '13 at 13:42
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2Question: why does this work? – Vaibhav Garg Aug 16 '13 at 10:44
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Edit the question and change it to: How do I generate square waves by adding sine waves together? I'd like the answer to that at the moment, what frequency partials go together to make a square wave. – Aran Mulholland Oct 09 '15 at 13:59
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Like this question: http://dsp.stackexchange.com/questions/26341/how-do-you-construct-common-waveforms-square-sawtooth-triangle-noise-from-s – Aran Mulholland Oct 10 '15 at 09:20
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Here is an interactive version of the GIF, where you can test how partials add up to shape a certain wave: http://toxicdump.org/stuff/FourierToy.swf
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