Gyrophares refers to the flashing, rotating lights typically found on emergency vehicles like police cars or ambulances. It's a vivid and somewhat specific word that isn't commonly found in song lyrics.
In "L'heure Dense," the phrase "Faire briller les gyrophares" (Make the flashing lights shine) evokes a sense of urban nightlife, urgency, or perhaps even a hint of danger or excitement, adding a unique atmosphere to the song's nocturnal setting.
Feu! Chatterton's "L'heure Dense" [The Dense Hour] plunges us into that specific, late-night mood when the world feels heavy and a bit melancholic. The lyrics describe "cette heure de spleen et d'ennui" [this hour of spleen and boredom], a dense, humid time around midnight or one AM, when shops are closing and minor desires haunt the narrator's "crâne embouti" [dented skull].
Our narrator isn't just sitting around, though! He's ready to "faire parler, faire saigner la nuit" [make the night speak, make it bleed], to make the emergency lights flash. He sees the night itself as a dancing figure in a "longue, longue robe altière, et ses fines ballerines" [long, proud dress, and its delicate ballet slippers], but quickly questions if he's dreaming. He even starts to insult the night in "langue rimbaldienne" [Rimbaudian language], demanding to know what secrets it hides "dessous sa gabardine" [under its gabardine coat]. It's a cool mix of high-minded poetic frustration and a very relatable late-night restlessness.