Moreover this reaction of locally procured materials on the genius who utilises them and to whose work their reaction imparts an added freshness, does not make the work any less individual, and whether it be that of an architect, a cabinet-maker or a composer, it reflects no less minutely the most subtle shades of the artist's personality, because he has been compelled to work in the millstone of Senlis or the red sandstone of Strasbourg, has respected the knots peculiar to the ash-tree, has borne in mind, when writing his score, the resources, the limitations, the volume of sound, the possibilities of flute or alto voice.