Preparing a course on sensory processing/perception for this fall and want to introduce the idea of Fourier image analysis, check my .HTLM demo on the sinewave composition of a squarewave grating (see, Campbell & Robson, J. Physiol. 1968): markwgreenlee.github.io/fourier-grat...
markwgreenlee.github.io
Square-wave gratings from sinewave gratings — Fourier synthesis