Translation:Mishnah/Seder Moed/Tractate Sukkah/Chapter 1/2
Appearance
One who makes a sukkah under a tree, it is like he made it under a house. If there is one sukkah on top of another one, the top one is kosher and the bottom isn't. Rabbi Yehudah says if nobody is living in the top one, the bottom one is usable.