Particles that, like 4He, show constructive interference are said to be bosons—a shorthand term for "particles obeying Bose–Einstein statistics." …One way to recognize bosons is their tendency to imitate one each other.... the presence of one boson increases the chance that another of its identical siblings will also appear in the same spot. There's an attraction between them. We will speak... of an attractive identity force drawing together identical bosons. Lasers are a spectacular example...

Longing for the Harmonies: Themes and Variations from Modern Physics (1987)