The final image was created in Illustrator but I used both Blender and fSpy extensively in creating reference material. I hope it’s relevant and apologies in advance if it’s not–I thought people here might find it of interest!
The inspiration actually came from an image I saw here a while ago–someone had done a Blender version of M.C. Escher’s print, Relativity, and it inspired me to create my own 3-axis world, with different worlds coming from each axis.