on November 11, 2019, SDO recorded a transit of Mercury (from our perspective, Mercury moved across the surface of our Sun over about 6.5 hours), a somewhat rare event (it happens every 3 to 13 years, the next one is in 2032). photos of the Sun during the transit show a Mercury sized-and-shaped black hole contrasted against our Sun (or, in this case, with inverted images, a Mercury sized-and-shaped white hole).
this cascading accordion stitches together 23 images, side-by-side, in sequence (3.5 inches height by width expandable to 7.2 feet). each image is sourced from NASA's SDO/AIA project, then enlarged, inverted, and excerpted to illustrate the transit as a cascading accordion (as if from the perspective of another craft traveling alongside Mercury).