Unstitching a neck opening or a pocket on Shabbos. Striking the final blow. Insulating a pot with dove’s wings. The Tale of Elisha, Man of Wings. Insulating with hides. Homeowner vs. craftsman. An object one is particular about becomes muktzeh. The rabbis who sourced the 39 categories of prohibited labor: what needed to build the Tabernacle rather than counting words in Torah.