Principia is the Arclinea model designed by Antonio Citterio, conceived as a kitchen system capable of combining contemporary rigor with references to Italian artisanal tradition. Its distinctive feature is the solid wood door with slatted detailing, an element that introduces warmth, material richness, and an immediately recognizable character. The project is based on a refined combination of selected woods, metals, and glass, achieving a balanced composition that allows for flexible configurations and welcoming environments. Display wall units, worktops with sophisticated finishes, and integrated technical solutions make it possible to organize the space in a functional way while maintaining an elegant and coherent aesthetic. Principia interprets the kitchen as the central place of the home, where material quality, construction precision, and design come together to offer an authentic and timeless everyday experience.