Clay Street typography
Most sidewalks in San Francisco have their respective street names embossed into the concrete near the intersections. Here on Clay Street near the Transamerica Pyramid, there are actual metal letters pressed into the ground. Unfortunately, two-thirds of them are wrong. The C and S are flipped vertically and the A and Y are flipped horizontally. Actually, I bet the T is backwards too, although since it's symmetrical it doesn't matter; my guess is that these metal letterforms are supposed to be installed with the flush side to the pavement, like the L here.