Proportion and layout are crucial in achieving Arconia-style spaces because they maintain balance, flow, and openness that support the quiet-luxury aesthetic. Proper scale ensures furnishings complement the room's architectural features, like vaulted ceilings and large windows, without clutter. Thoughtful layout encourages natural light penetration and creates spaces that feel spacious yet cozy. Paying attention to these elements prevents stiff, staged designs and instead promotes authentic, comfortable interiors that honor both tradition and modern living needs.