This is an image I created in the scientific programming environment Matlab while doing some maths, trying to understand a particular aspect of stereo (“3D”) vision. The funny thing is that I can now no longer even remember how I generated it! I think it is probably a Fourier phase spectrum of some sort. I threw up this image in my work, saved the figure, and carried on. Much later I came back to it and was struck by how beautiful and complex it is. In its repeating cells of interlocking curves, it reminds me of Celtic knotwork like that found in the Lindisfarne gospels.