"analog child being introduced to the digital magic." In high school, my electricity teacher made us draw the sine waves of monophasic and tri-phasic (if that'

"analog child being introduced to the digital magic." In high school, my electricity teacher made us draw the sine waves of monophasic and tri-phasic (if that's what it's called in English?) voltages manually by drawing into a Cartesian arrangement and projecting onto a line diagram, much like the animation about halfway through the article. It was tedious and it seemed very repetitive to draw the various variations, but in later years I started to understand its relevance (also with regards to the relation between current, voltage and power). Just in general it gave me such a good example of the relationship between the geometry, trigonometry and calculus involved, much better than the canonical speed/distance example ever did (for me). There are only a few core concepts I learned in high school that I still use often, and this is definitely one of them.