For the source text click/tap here: Sukkah 10
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Decorations are discussed at some length. The rabbis are careful to specify whether or not hangning decorations will change the area of the sukka.
It was stated: The decorations of a Sukkah do not diminish the height of the Sukkah. Rav Ashi said: But at the side, they do diminish (the width of a Sukkah).
There is a debate in the Gemara regarding a sheet that was hung for decorative purposes at a distance of more than four tefachim away from the s’chach. Rav Nachman rules that the Sukkah is valid because the sheet is subordinate to the s’chach. Rav Chisda and Rabbah bar Rav Huna maintain that the Sukkah is invalid because the decorations are considered independent of the s’chach above it.
The Shelah writes that hanging ornaments in the Sukkah reflects our endearment for the mitzvah of Sukkah. Thus, the more one enhances the beauty of the Sukkah with ornaments, the more praiseworthy he is.
Although there is no formal halachic obligation to decorate the Sukkah, doing so is clearly an ancient custom (decorations are mentioned in early and later writings of Chazal), and it fulfills the precept of “this is my G-d, and I will beautify Him” (Shemos 15:3).
And though our principal focus concerning decorations is that they should adorn the Sukkah as best as possible, we explore halachic issues that Sukkah decorations are liable to raise.