For a very long time, the photonic structures of insects have fascinated observers and scientists. They have been widely studied, both from a biological point of view for their strong implication in inter- and intraspecific communications, and from a physical point of view as a source of inspiration for the development of artificial structures. In most cases, attention has been paid to their optical properties in reflection and, to a lesser extent, their impact on the light emitted by fluorescence. A new phenomenon has recently been highlighted: the ability of certain structures to guide non-reflected light or emitted light. We will illustrate these two phenomena, perhaps more widespread than we thought, by three common species: Morphidae Morpho menelaus; Papilionidae Troides magellanus; and Cerambycidae Sulawesiella rafaelae. These phenomena have been studied little, and many more examples will likely emerge soon.