Kalach Pitchei Chokhmah and Tanya

Both texts address kav (קו) and chalal (חלל) within the tzimtzum framework. Text 1 presents kav as a descending line (קו אחד יורד) that fills the chalal, functioning as a conduit (צינור) between Ein Sof and the space. Text 2 emphasizes kav as light of Ein Sof clothed in souls (הַ״קַּו״ הַמְלוּבַּשׁ בְּנֶפֶשׁ־רוּחַ־נְשָׁמָה), understanding chalal through the lens of divine contraction (צִמְצוּם) creating boundary (גְּבוּל). Text 1 focuses on kav's structural/connective role, while Text 2 emphasizes kav's metaphysical identity as contracted divinity within created beings. Both accept the same mechanism but highlight different aspects of how kav functions—Text 1 emphasizes mediation, Text 2 emphasizes divine immanence through contraction.