Square

Square is friction that drives change, a 90° angle creating dynamic tension between two planets. Rather than easy flow or stark opposition, the square is productive conflict: the energies want different things and push against each other, but that friction catalyzes growth. Mars square Saturn, for instance, isn't easy (it's driving urgency against caution), but it builds discipline through the constant friction. Squares are the aspects most likely to spark action and self-improvement because the discomfort motivates change.