Although the title suggests a blue interior, the room itself isn't actually blue. Instead, the daylight streaming in from the window reflects off surfaces, shaping the room's colors and forms. This blue hue lends a cohesive tone to the scene, while the composition remains vibrant and intricately detailed. The model in the painting is Asta Nørregaard, a fellow artist and friend of Backer’s, and the work was created in Paris, where both women resided at the time.