Created in 1960, *Caranguejo* (Crab) is a sculptural work by Brazilian Neoconcrete artist Lygia Clark, constructed from interconnected aluminum planes that fold and hinge along precise geometric edges. The piece belongs to Clark's *Bichos* (Critters) series, in which modular metal forms are designed to be manipulated by the viewer, shifting into an infinite variety of configurations through participatory interaction. This emphasis on sensory engagement and the dissolution of boundaries between artwork and audience became central to Clark's evolving investigation of embodied experience.