Lygia Pape's *Livro noite e dia (Book of Night and Day)* is a multi-part work composed of eight wooden panels painted with acrylic and tempera, evoking the elemental contrast between darkness and light. The work reflects Pape's engagement with the Brazilian Concrete and Neoconcrete movements, using bold geometric forms and a restrained palette to explore rhythm, duality, and visual perception. Together, the panels function like pages of an artist's book, inviting the viewer to move through the work as a sequential, almost meditative experience.