"Derech Tashmisho"/Mode of Use. Opening and closing a collapsible stroller is permitted due to this concept. However, placing a plank or board into a doorway, or gap in a wall to serve as a door is forbidden. This would be an act of construction of plugging the gap in the wall. Demolition Hebrew: (Soter) Definition: Demolishing for any constructive purpose. For example, knocking down a wall in order to extend or repair the wall would be demolition for a constructive purpose. Combing a wig to set it correctly and pulling out hairs during the procedure with a metal toothed brush or comb would be constructive 'demolition', as each hair that is removed in the process of the wig (a utensil) is progressing its state towards a desired completion. Each hair's removal partially demolishes the wig (for these legal purposes) and is considered constructive when viewed in context of the desired goal. See further: Mishneh Torah Shabbat 10:15; Chayei Adam Shabbos 39, 43 Extinguishing a fire Hebrew: (Mekhabeh) Definition: Extinguishing a fire/flame, or diminishing its intensity. While extinguishing a fire is forbidden even when great property damage will result, in the event of any life-threatening fire, the flames must be extinguished, by the principle of pikuaḥ nefesh. See further: Shulkhan Arukh Orach Chayim 334; Chayei Adam Shabbos 45 Ignition Hebrew: (Mav'ir) Definition: Igniting, fueling or spreading a fire/flame. This includes making, transferring or adding fuel to a fire. (Note, however, that transferring fire is permitted on Jewish holidays. It is an exception to the rule that activities prohibited on the Sabbath are likewise prohibited on holidays.) This is one of the few Sabbath prohibitions mentioned explicitly in the Torah (). Judaism requires Sabbath candles to be lit before the Sabbath; it is forbidden to light them on the Sabbath. Ignition is one of the Sabbath laws that has been cited to prohibit electricity on Shabbat. See further: Mishneh Torah Shabbat 12:1; Chayei Adam Shabbos 46 Final Completion/Fine-tuning/Perfection Hebrew: (Makeh B'patish), literally, striking with a hammer. Definition: Any initial act of completion. This complex, and possibly most abstract section of Sabbath law, refers to activities completing an object and/or bringing it into its final useful form. For example, if the pages of a newspaper were poorly separated, slicing them open would constitute the final act of completion of the pages. Using a stapler involves transgressing final completion/fine-tuning/perfection in regard to the staple