Divinity in Judaism connotes revelation of God's true unity, while the shells conceal holiness, as a peel conceals the fruit within. They are therefore synonymous with idolatry, the root of impurity through ascribing false dualism in the Divine, and with the Sitra Achra (סטרא אחרא "Other Side"), the perceived realm opposite to holiness. They emerge in the descending seder hishtalshelus (Chain of Being) through Tzimtzum (contraction of the Divine Ohr), as part of the purpose of Creation.