This animation with accompanying explanation illustrates the principle of wave superposition: when two (or more) waves travel through the same medium at the same time, the waves pass through each other without being disturbed. Net displacement of the medium at any point in space or time is the sum of the individual wave displacements. Author Dan Russell's text provides support for both concept formation and algebraic applications. It is part of a larger collection of animations on wave motion, acoustics, and sound.