Mars square Lilith (orb 0.0°) creates concrete friction between the two planets. The orb is extremely tight; this aspect is one of the chart's strongest signals.
Here, Mars in Aquarius in House 11 brings action, courage, competition, and effort into House 11 (networks, audience, groups, ideas, ideologies, political beliefs, and collective projects), with Aquarius style (independence, networks, distance, and collective change); Lilith in Taurus in House 12 brings pure ideal, absolute demand, fascination, and refusal of compromise into House 12 (retreat, contemplation, long time, and possible confinement), with Taurus style (nature, good food, physical sensuality, roots, resources, and perseverance).
Concrete friction: this aspect creates tension between anger, desire, action, impossible ideal, and refusal to yield. Visible angle: Lilith near the Rising sign (orb 1.0°) touches an angle; this aspect is easier to notice through first impression, body language, reflexes, and entry style. House 11 (networks, audience, groups, ideas, ideologies, political beliefs, and collective projects) is in friction with House 12 (retreat, contemplation, long time, and possible confinement); this can create blockage, inhibition, overreaction, or repeated conflict between the two fields.