The structural focus of this work is the gradual process of inversion of a simple musical phrase. But the ‘polar inversion’ referred to in the title has a meaning beyond the purely musical, suggesting the reversal of the earth’s own magnetic poles. Cent dix-sept jours avant l’inversion des pôles thus stands as a metaphor for the end of the world.. Format: iv/7+4x4. Media: Full score & parts. Duration: 6'.