The road was crowded and there were screens of corn-stalk and straw matting on both sides and matting over the top so that it was like the entrance at a circus or a native village. We drove slowly in this matting-covered tunnel and came out onto a bare cleared space where the railway station had been. The road here was below the level of the river bank and all along the side of the sunken road there were holes dug in the bank with infantry in them. The sun was going down and looking up along the bank as we drove I saw the Austrian observation balloons above the hills on the other side dark against the sunset.

—A Farewell to Arms, Ernest Hemingway

Which is an example of “rich” imagery?