Make an Zohar for the ark, and terminate it within a cubit of the top. Put the entrance to the ark in its side; make it with bottom, second, and third decks.

“You shall make a Zohar for the ark...” (Genesis 6:16).
“You shall make a tzohar for the ark” – Rabbi Ḥunya, Rabbi Pinḥas, Rabbi Ḥanin, and Rabbi Hoshaya did not disagree about this. Rabbi Abba bar Kahana and Rabbi Levi did disagree. Rabbi Abba bar Kahana said: It was a window. Rabbi Levi said: It was a [luminous] precious stone. Rabbi Pinḥas said in the name of Rabbi Levi: All twelve months that Noah was in the ark, he needed neither the light of the sun during the day nor the light of the moon at night; rather, he had a precious stone that he had suspended. When it was dim he knew that it was day, and when it shined brightly he knew that it was night.

Rabbi Huna said: We were once fleeing from enemy troops in a cave in Tiberias, and we had lamps with us. When they were dim, we knew that it was day, and when they shined brightly, we knew that it was night..."

With regard to the verse: “A tzohar you shall make for the ark” (Genesis 6:16), Rabbi Yoḥanan says that the Holy One, Blessed be He, said to Noah: Set precious stones and jewels in the ark so that they will shine for you as the afternoon [tzohorayim] sun.

(1) צהר A LIGHT — Some say this was a window; others say that it was a precious stone that gave light to them (Genesis Rabbah 31:11).

And it says (Genesis 6:13) "And God said to Noah", God, this is the Shekhina (Divine presence), "The end of all flesh" etc. (Genesis 6:16) "Make a window for the Ark", this is a mystery of the body. "You, your sons" etc., men alone, and women alone. (Genesis 6:22) "And Noah made", this is a holy covenant. "According to all that God commanded him", this is the Shekhina. (Genesis 7:1) "And the Lord said to Noah", here is the attribute of mercy.

“This is the table which is before the Lord, who spreads the heavens like a canopy for a tent sets earth over water and feeds the creatures of His home in three divisions: “the bottom, middle, and topmost decks.” In the highest realm are the ministering angels nearest to Him: the cherubim, the seraphim, the ofanim, and the arielim. They are attendants in His palace; in legions they feast on the light of His presence, from the flowing light of His own radiance. The middle realm is the “vest of the heavens,” an assembly of fire and water –rains constraining and constrained – by day and night God restrains them. The eyes of their minds see [tzofim] their Master’s delight as their food, far sweeter to them than choice honey [tzufim]. They hunger for the Cause of their existence; the pillars supporting their realm are suspended by the arm of His wisdom, and quake at His rebuke. But the lowest dwelling, a circle radiating from its midpoint, has measurable dimensions. Our food is not their food. Their food is conceived in their mind, when they see the face of their Maker. Our food is meager bread, water, and tears, gotten by hard work and toil.