Wave particle duality is difficult to comprehend. However, quantum carpets provide an opportunity to visualize this property. Consider the graph of the probability distribution of an excited electron in a confined space (particle in a box), where brightness of color corresponds to momentum. Lines of dull color (ghost terms or canals) appear across the quantum carpet. In these canals, the momentum of the electron is very small. Destructive interference, when the trough of a wave overlaps with the crest of another wave, causes these ghost terms. In contrast, some areas of the graph display bright color. Constructive interference, when the crests of two waves overlap to form a larger wave, causes these bright colors. Thus, quantum carpets provide visual evidence of interference within electrons and other wave packets. Interference is a property of waves, not particles, so interference within these wave packets prove that they have properties of waves in addition to properties of particles. Therefore, quantum carpets display wave particle duality.