Q: This and this. Are they duplicates? The first specifically mentions code in a link, but based on this, I think the problem was general to all code, making them dupes
I don't see them as dupe. They're describing different problems on the surface (therefore different bug reports), though the underlying problem may be the same
I just noticed something really cool. Take a flashlight with a parabolic mirror. Shine it on a nearby wall. If you put your finger across the center of the front of the flashlight, your finger's shadow will show up on the wall, but the bright spot in the middle of the beam will appear to go through your finger. (It has to do with the way parabolas reflect light, but I won't spoil it)