Example of a spherical convolution with five rings. The method developed by Krachmalnicoff & Tomasi (2019) (originally for HEALPix) is adapted to the Fibonacci sphere with the improvement that instead of zero-padding, the periodic nature of rings is used. Some facets inside the rings are black because they are not included in the kernel, since the number of facets in each respective ring must match for all kernel locations on the sphere.