Depends how you look at the picture from one perspective it looks like a close-up of a wall that’s been carved out by water overtime. From another perspective it looks like a far away shot of the side of a mountain showing the inside of caves and seeing how these caves have their own support pillars. Though because the film is in black-and-white the detail is really in the contrast of the picture and up to the viewers eyes to make its conclusion.
Good observations regarding the viewer’s proximity and how to interpret the image.