What Is a Fourier Series? Heat Flow and Rotating Circles

3Blue1Brown · Explainer · YouTube title: But what is a Fourier series? From heat flow to drawing with circles | DE4

Why it's here

Recommended as the visual explanation that makes Fourier series and transforms click, even for laypeople.

What it covers

3Blue1Brown introduces Fourier series, from the heat equation to drawing arbitrary shapes with rotating circles. It builds a visual intuition for decomposing functions into sine waves.