A low frequency audio signal is generated by a large speaker in the top
of the sonic sifter. The signal hits a latex diaphragm on the top of the sieve stack, and causes oscillation. There is also a latex receiver at the base of the sieve stack, and the sieve stack is otherwise sealed, so the latex receiver also oscillates. The air in between the two latex
components, therefore moves up an down, carrying the particles with it.