  We discuss the notion of coherent states from three different perspectives:
the seminal approach of Schroedinger, the experimental take of quantum optics,
and the theoretical developments in quantum gravity. This comparative study
tries to emphasise the connections between the approaches, and to offer a
coherent short story of the field, so to speak. It may be useful for
pedagogical purposes, as well as for specialists of quantum optics and quantum
gravity willing to embed their perspective within a wider landscape.
