Many researchers think that the density of a violin's wood affects the sound of a violin. Researchers from the Netherlands were curious to know if the density really affected the violin, so they did a test which told them that although their densities were similar, they had greater differences in their seasonal growth. Density is involved with the seasons because the wood is more dense in the winter over the summer which explains the pattern resonating the quality of the wood. The wood's density impacts the sound and efficacy of the violin which may explain the superiority of Stradivari’s violins. The passage is important because it explains how density might not just affect the violin, but other materials.