The emergence of a ruin-aesthetic comes after Petrarch, and is initially owed to architects like Brunelleschi and to painters like Raphael. Architects wanted to build in the Roman manner, all’antica, and painters introduced Roman ruins into the background of their pictures. Such was the commitment to the study and imitation of the Roman style that the need to conserve the ruins was recognised and advocated. Hitherto it had never occurred to anyone anywhere to urge that a ruined structure should be preserved for its historical value. But a further value was now attached to the ruins of Rome, namely the aesthetic: the ruins were looked upon as attractive in themselves. The ruins also became the object of study and analysis by a new breed of scholar, the antiquarian and topographer, such as Flavio Biondo, who also wanted to ensure their preservation for future ages to admire. This is a new feature of ruin-mindedness: whatever is deemed beautiful must be preserved for later generations to study and admire and imitate. Since those later generations will include foreign visitors, tourism comes to be recognised as a sound economic reason for conserving the handsome material remains of ancient Rome.