Obra do Berço, Modernist building in Lagoa, Rio de Janeiro, Brazil.

Obra do Berço is a modernist structure in Lagoa featuring two distinct volumes: a cubic section with three floors and an L-shaped form supported by cylindrical pillars. The composition balances solid and floating elements with extensive glazing throughout.

In 1928 Marianna Sodré and Lysia Cezar de Andrade founded the institution in Laranjeiras, offering prenatal and childcare services. A donated plot near Lagoa Rodrigo de Freitas allowed a new headquarters; Lysia asked her cousin Oscar Niemeyer, then a beginner in Lúcio Costa's office, to design it. The institution was officially recognized on 21 November 1937, and the reinforced-concrete building was completed the following year.

The building displays hallmarks of Brazilian modernism through its adjustable sun screens and curved forms that remain visible today. These design choices show how the architecture responds to tropical climate needs.

The building is located in an easily accessible area near Lagoa and continues to serve its original purpose. Visitors should note its proximity to lakes and parks to understand the site within its urban setting.

The facade features adjustable concrete sun shields that Niemeyer implemented after returning from the United States. This practical innovation replaced the originally fixed version and shows his design evolution during construction.