Thanks! Macroexpanded:

An Interactive Guide to the Fourier Transform (2012) - https://news.ycombinator.com/item?id=27229836 - May 2021 (79 comments)

An Interactive Guide to the Fourier Transform - https://news.ycombinator.com/item?id=10635075 - Nov 2015 (18 comments)

An Interactive Guide To The Fourier Transform - https://news.ycombinator.com/item?id=4948082 - Dec 2012 (25 comments)