The addition was part of a full renovation of the single-storey Haussmann-era apartment. Atelier 37.2 wanted to create a new sculptural volume visible from the kitchen, living space and three bedrooms.
"By creating this tiny singular space within the wider space of the apartment, we play with density variations," the team said.
"Beyond its function, this installation is a form of aesthetic enigma, somehow like a window facing unlikely landscapes."
Constructed of birch wood, the three-metre-high volume is made up of multiple facets, creating a diamond-shaped volume with a pointed top – the inspiration for the project name Enter The Diamond.
The sharp linear edges of the structure contrast with ornate ceiling mouldings and white-painted walls.
Minimal materials and a stripped-back colour palette feature throughout the rest of the apartment, including herringbone flooring, white-painted doors, and dark-toned furniture and window frames.
The single-storey property dates back to Baron Haussmann's reorganisation of Paris during the second half of the 19th century, when all structures were designed under height restrictions and constructed from the same cream-coloured stone.
Other recently-updated buildings from this era include Dior Homme's new offices by Antonio Virga Architecte, and an apartment with multicoloured flooring and space-saving stairs.
"This sculpture fits perfectly with the minimalism of the place, though it contrasts fiercely with the moulding and the Haussmann Classicism," said the architects.
"This tension generates a fictional potential that plays with the imagination of the inhabitants."
Atelier 37.2 was founded in 2009 by Italian architect Francesca Bonesio and French photographer Nicolas Guiraud.