The geologist sees rock formations atop plates drift on the rolling currents deep in the Earth’s mantle, Those rocks crack and open up from the processes of erosion to hollow out a cave. Where the deposits from dissolved minerals collect to form a myriad of shapes called speleothems.
The spelunker puts on a carbide lamp equipped helmet, kneepads to prevent hamburger knee, and carries piton spikes to drive into cracks as needed to belay into the glistening underground space that upon first sight appears as if it were made to appear that way. It’s a brilliant display of mysterious intention by something far greater than any human achievement. Yet it is the dizzying reminder of how random the visual state of terrain actually is. The hand of erosion carves and sculpts without regard for the spelunker’s eyes met with such a vision on an immense scale of time.
The philosopher enters the cavern through the mind. Sees the cave dwellers who only see shadows as reality. Witnesses the journey back into the darkness after seeing the outside world and experiencing its glaring truth. The light so strong that it cannot be forgotten by its witness imbues the cavern’s folds with the philosopher’s thoughts.