Okay: yes the pictures are freaky but the phenomenon is not really as surprising as it may first seem. When you think of it in high-dimensional geometric terms it's understandable why there would be *some* image that tends to soak up negative-prompt queries.
One of the last papers I worked on before leaving academia was
Pagh, R.; Silvestri, F.; Sivertsen, J.; and Skala, M. 2017. Approximate furthest neighbor with application to annulus query. Information Systems, 64:pp. 152-162.