Minor etymological note: the word plumb describes something that's hanging vertically. It comes from the latin word plumbum (lead). When people wanted to make s

Minor etymological note: the word plumb describes something that's hanging vertically. It comes from the latin word plumbum (lead). When people wanted to make sure something was vertical, they'd hang a lead weight from a string, and align the string with whatever was supposed to be vertical. Even though we've moved on to different metals, we still call them plumb bobs, and we still say that a vertical part of a house is "plumb". https://www.homedepot.com/b/Tools-Hand-Tools-Marking-Tools-Layout-Tools-Plumb-Bobs/N-5yc1vZc97n https://www.homedepot.com/b/Tools-Hand-Tools-Marking-Tools-L...