we learn that from the torah, from the bible, where we are told b'sukkah teshvu shevat yamim, you shoulddwell in a sukkah for seven days. we leave our permanent dwelling, our home, and we move to this temporary dwelling to remember the transience of the israelites and their journey from egypt to israel, and also to remind us that in some ways all of life is really temporary, and all of life, life is very fragile, and so that is what we do. we dwell in these sukkahs. we eat in them, we sleep in them, we try and spend as much time as possible within them. the fundamental laws about a sukkah that make it kosher, it needs to have two and a half walls. just about anything can be used for walls. it can't be material that will ultimately smell, which would cause someone to want to leave the sukkah, or can't be something that will fall over in the wind. but aside from that, any material can really be used. there is a big distinction made between what's allowed to be used for the walls and what can be used for the roofing material. the roofing material needs to be kosher roofing material, which i