Mercury square Lilith (orb 4.6°) creates concrete friction between the two planets. The orb is moderate; it stays secondary beside tighter signatures.
Here, Mercury in Leo in House 10 brings intellect, language, thought, and technique into House 10 (vocation, status, responsibility, and public image), with Leo style (presence, pride, creation, and the wish to be seen); Lilith in Taurus in House 6 brings pure ideal, absolute demand, fascination, and refusal of compromise into House 6 (daily work, technique, and bodily discipline), with Taurus style (nature, good food, physical sensuality, roots, resources, and perseverance).
Concrete friction: this aspect creates tension between thought, speech, obsession, purity demand, and refusal to let go. Visible angle: Mercury near the Midheaven (orb 1.7°) and Lilith near the Descendant (orb 3.8°) touch angles; this aspect is easier to notice through social role, reputation, career, and public image; also through direct relationships, partners, opponents, and the way others are met. House 10 (vocation, status, responsibility, and public image) is in friction with House 6 (daily work, technique, and bodily discipline); this can create blockage, inhibition, overreaction, or repeated conflict between the two fields.