Énergies, Bronze sculpture at Gare de Châtelet - Les Halles, France

Énergies is a bronze sculpture approximately 8 meters long and 3 meters high with a concave rectangular form. The polished surface displays carved patterns, figures, and mathematical symbols integrated into the station's main hall.

French artist Pierre-Yves Trémois created this monumental work in 1977 for the Châtelet-Les-Halles station complex. It was installed during a period of major modernization of Paris's public transportation infrastructure.

The large disc carved behind the central figure carries the Schrödinger equation and two expressions of Heisenberg's inequalities around its rim. These inscriptions sit on the polished bronze of a work made for a busy transit hall, so scientific notation is read at walking pace by commuters.

The work hangs on the back wall of the Lescot exit in the exchange hall, facing the turnstiles and ticket counters. Passers-by see it through the glass that protects the bronze forms.

The relief is slightly concave and studded with separate motifs, including a human head and a fish, besides the central ray. Behind the ray a wide disc is hollowed out, its rim carrying Schrödinger's equation and two expressions of Heisenberg's inequalities.