The image captures an upward-angled view inside the Salle Labrouste, a historic reading room situated at the Richelieu site of the Bibliothèque Nationale de France (BnF) in Paris, France

The image captures an upward-angled view inside the Salle Labrouste, a historic reading room situated at the Richelieu site of the Bibliothèque Nationale de France (BnF) in Paris, France. The primary subject is a large, oval-shaped glass skylight forming the central ceiling, constructed from a grid of numerous small, dark-framed rectangular and square panes through which bright, diffused light from an obscured sky is visible. This skylight is encompassed by a wide, ornate gilded frame adorned with intricate relief patterns. Below the main skylight, the circular base of the dome features multiple smaller, uniformly spaced circular windows (oculi), each with a distinct radial spoke-like pattern, also admitting light. Inscriptions of various city names, including "JERUSALEM," "PARIS," "LONDRES," "BABYLONE," "VIENNE," "ALEXANDRIE," and "BERLIN," are visible in capital letters along a frieze encircling the rotunda below the skylight. The interior architecture exhibits dark, rich tones with arched openings, decorative pilasters, and various ornamental motifs. A section of traditional wooden library shelving filled with books is partially visible in the lower left portion of the image. The scene is static; no individuals, specific actions, or interactions are depicted.