This image is a horizontal image through the inner segments of rod and cone photoreceptors in the mammalian retina, demonstrating the massive numbers of mitochondria, particularly the cone photoreceptors.
This is an FFT image of the original image, with a little chatter associated with sectioning. I was able to perform a reverse FFT to remove the chatter by identifying the frequency space associated with the regularly repeating pattern of chatter, and masking it off to selectively eliminate it from the image. I’m always tickled by the power of FFTs. Every time I do one, it feels like magic.