I finally have something to ask the oracles about. (I was planning to ask about a chip that looked like a current sensor, but that disappeared before I could.)
This device appears to be some kind of light sensor. It has no markings that I can see. I found it on the floor by an electronics recycling bin that people look through for parts. The chip and two capacitors are mounted on FPC, which is mounted on a stamped (?) aluminium piece, which has some glue on the back. It's a hard, white, translucent glue that I've seen in optics before.
From the top, with the loose ends of the FPC facing me and the sensor facing up, the traces go like this: 1 narrow, 2 wide, 7 narrow on the left; 6 narrow on the right. One capacitor is across the two wide traces (so those are likely power and ground) and the other capacitor (the angled one) is from one of the wide traces (probably ground) to a trace that goes under the chip. The one narrow trace on its own wraps around to the other side of the chip. The loose ends have some markings as if they're inserted into connectors that far, but no copper is exposed, and the edge appears to be torn—it's not quite straight and square on either side.
Pictures 1–3 show it on some painter's tape. Picture 4 shows it on a USB standard-A plug for scale. Picture 5 was taken with a USB microscope.