The following account was recorded in the agent's log during your transmission: Water drips from the crystalline latticework of a naturally occurring, kilometer-long Klein bottle somehow embedded in the rock of a massive, asteroid-impact crater. Umm, the air's heavy with the scent of wet earth and iron, with this low-pitched humming noise... like it's coming from the rock itself, despite the stillness of the air. The sky above is this sickly shade of chartreuse, and the crater's center is occupied by a flawless, four-dimensional pyramid, its faces simultaneously convex and concave. The sun's beating down at a low angle, casting weird, curved shadows across the crater walls.