Their four "concentric" terms are derived from Ezekiel's vision (1:4), "And I looked and behold, a whirlwind came out of the north, a great cloud, and a fire infolding itself, and a brightness was about it..."[4] The "Three Impure Qlippot" (completely Tamei "impure") are read in the first three terms, the intermediate "Shining Qlippah" (Nogah "brightness") is read in the fourth term, mediating as the first covering directly surrounding holiness, and capable of sublimation. In medieval Kabbalah, the Shekhinah is separated in Creation from the Sefirot by man's sin, while in Lurianic Kabbalah Divinity is exiled in the qlippot from prior initial Catastrophe in Creation. This causes "Sparks of Holiness" to be exiled in the qlippot, Jewish Observance with physical objects redeeming mundane Nogah, while the Three Impure Qlippot are elevated indirectly through Negative prohibitions.