From Raphael Lemkin’s 1933 Madrid Paper, for the day that is in it:
ACTS OF VANDALISM
(Destruction of the culture and works of art).
AN ATTACK TARGETING A COLLECTIVITY can also take the form of systematic and organized destruction of the art and cultural heritage in which the unique genius and achievement of a collectivity are revealed in fields of science, arts and literature. The contribution of any particular collectivity to world culture as a whole, forms the wealth of all of humanity, even while exhibiting unique characteristics.
Thus, the destruction of a work of art of any nation must be regarded as acts of vandalism directed against world culture. The author [of the crime] causes not only the immediate irrevocable losses of the destroyed work as property and as the culture of the collectivity directly concerned (whose unique genius contributed to the creation of this work); it is also all humanity which experiences a loss by this act of vandalism.
In the acts of barbarity, as well as in those of vandalism, the asocial and destructive spirit of the author is made evident. This spirit, by definition, is the opposite of the culture and progress of humanity. It throws the evolution of ideas back to the bleak period of the Middle Ages. Such acts shock the conscience of all humanity, while generating extreme anxiety about the future. For all these reasons, acts of vandalism and barbarity must be regarded as offenses against the law of nations.