The Arc of Brilliant Colors:
After a rain, Walter sees an arc of brilliant colors in the sky. He has seen these before and knows that they don't last long, but he would like to know what is at the end of one.
The left side of the arc appears to be near the mausoleum, while the right side appears to be dangerously close the the eastern cliff.
Run to the left side: It disappears
Run to the right side: ?