A quantum spin liquid is a state of matter where magnetic spins remain disordered even at absolute zero — frustrated interactions prevent any classical ordered ground state. On the triangular lattice shown, antiferromagnetic J1 bonds (nearest neighbors) cannot all be satisfied simultaneously: flipping any spin to satisfy two bonds will frustrate a third. The ratio J2/J1 tunes the degree of frustration — near 0.5 the system is maximally frustrated and classical order is suppressed, leaving a quantum superposition of many competing configurations. Colors encode spin orientation (hue) and quantum uncertainty (brightness). Watch spins fluctuate without freezing as temperature → 0.