Building the Perfect Sukah

Reb Shimon comes to the Rabbi and says “I want to build a perfect Sukah, exactly as the Talmud says. Tell me what to do.” The Rabbi strokes his beard, opens the Talmud, and begins to write. He hands Shimon the instructions. Shimon hurries home, follows the instructions to the letter, and just as he attaches the last piece the entire structure collapses in a pile of rubble and dust. In tears and anger he returns and says “Rabbi, I followed the Talmud’s instructions exactly and just when I finish, the entire Sukah collapses in a pile of rubble and dust!” The Rabbi strokes his beard, opens the Talmud, and begins to read again. “Yes”, says the Rabbi, “Rashi makes the very same comment.”