What Alberti claimed that a truly beautiful work must have?

Leon Battista Alberti claimed that a truly beautiful work must possess three key qualities: harmony, proportion, and clarity. He believed that these elements combined to create an aesthetic experience that resonates with viewers. Alberti emphasized that beauty arises from the effective organization and balance of parts within a whole, allowing for both visual pleasure and intellectual engagement. Ultimately, he asserted that beauty is a reflection of order and reason in art and architecture.