A laser beam (pink, glow line) is reflected by a beam splitter (cyan cube) and enters a Mach‐Zehnder interferometer. Due to the quantum Cheshire effect, its wave property (blue curves in the lower arm of the interferometer) and particle property (golden points in the upper arm of the interferometer) are spatially separated and propagated individually. See P. Chowdhury et al., pp. 1379–1388.