The φ⁴ kink: φ_K(x) = tanh((x−x₀)/√2). This topological soliton interpolates between the two vacua φ=±1 of V(φ)=(1−φ²)²/4. Kinks have topological charge Q=±1 and cannot be continuously deformed to the vacuum. Click to spawn kink-antikink pairs.