Can someone help me understand what Severian is seeing when he's on the cliff in sword of the lictor? (Widows House chapter)
Particularly this passage -
'At one point, only slightly less than halfway down, the line of the fault had coincided with the tiled wall of some great building, so that the windy path I trod slashed across it. What the design was those tiles traced, I never knew; as I descended the cliff I was too near to see it, and when I reached the base at last it was too high for me to discern, lost in the shifting mists of the falling river. Yet as I walked, I saw it as an insect may be said to see the face in a portrait over whose surface it creeps. The tiles were of many shapes, though they fit together so closely, and at first I thought them representations of birds, lizards, fish and suchlike creatures, all interlocked in the grip of life. Now I feel that this was not so, that they were instead the shapes of a geometry I failed to comprehend, diagrams so complex that the living forms seemed to appear in them as the forms of actual animals appear from the intricate geometries of complex molecules. However that might be, these forms seemed to have little connection with the picture or design. Lines of color crossed them, and though they must have been fired into the substance of the tiles in eons past, they were so willful and bright that they might have been laid on only a moment before by some titanic artist's brush. The shades most used were beryl and white, but though I stopped several times and strove to understand what might be depicted there (whether it was writing, or a face, or perhaps a mere decorative design of lines and angles, or a pattern of intertwined verdure) I could not; and perhaps it was each of those, or none, depending on the position from which it was seen and the predisposition the viewer brought to it. Once this enigmatic wall was passed, the way down grew easier. It was never necessary again for me to climb down a sheer drop, and though there were several more flights of steps, they were not so steep or so narrow as before. I reached the bottom before I expected it, and looked up at the path down which I had traveled with as much wonder as if I had never set foot on it— indeed, I could see several points at which it appeared to have been broken by the spalling away of sections of the cliff, so that it seemed impassable.'
Is this something adjacent to the moon portrait in the picture-cleaner? Can I figure it out or do I need further context? This is where I've read up to but I'm very interested, it's such a curious page.