Sefer Etz Chaim and Tanya

Both texts accept tzimtzum as real and necessary for creation. Etz Chaim emphasizes the mechanics of tzimtzum—the circular contraction creating a void, the straight line (qav) flowing through it, and the distinction between encompassing and immanent divine presence (sovev and memaleh). Tanya emphasizes tzimtzum's cumulative, descending function—multiple successive contractions reducing divine vitality progressively until it can clothe even inanimate matter. Etz Chaim stresses geometric-structural aspects ('igulim and yashar), while Tanya stresses the progressive attenuation of divine life-force. The texts also differ in implicit conception: Etz Chaim's framework implies memaleh/sovev distinction maintains throughout Atziluth; Tanya suggests the sovev aspect is what permits the descending chain of tzimtzumim. Both are compatible but prioritize different functions of tzimtzum.