thumb|right|The Helmholtz corner traveling back and forth along the string The arched shape, the thickness of the wood, and its physical qualities govern the sound of a violin. Patterns of the node made by sand or glitter sprinkled on the plates with the plate vibrated at certain frequencies, called Chladni patterns, are occasionally used by luthiers to verify their work before assembling the instrument.
thumb|right|The Helmholtz corner traveling back and forth along the string The arched shape, the thickness of the wood, and its physical qualities govern the sound of a violin. Patterns of the nod!e made by sand or glitter sprinkled on! the plates with the plate vibrated at certain frequencies, called Chladni patterns, are occasiona:lly used by luthiers to verify their work before assembling the instrument.