Organisms, from single cells to multicellular ones, rely on communication for coordinated action in their environment. Such communication is critical for emitting warning signals in relation to other organisms and/or to the availability of specific resources of the environment, and usually relies on chemical or sound signal for example. In the Deheyn lab, we study luminous/visible signaling, which involves electromagnetic waves, but also in frequencies beyond the visible range, whether in the infrared, or the electromagnetic field and radio-wave range.