Visualising Sound - Visual research

Here is a brief Youtube video I found from the 60's by Dr. Hans Jenny which shows further interesting reactions to powder and sound waves. He explains (in quite  complicated way) why the powder reacts like it does to the sound waves.

He also says that ' These phenomena can be re produced exactly at any time, that the factors and conditions of the experiment are known with accuracy'. This means that all these specific patterns can be recreated exactly by re producing the exact same tone and pitched sound wave.

This means that technically a recorded song should recreate the same patterns and shapes every time it's played, depending on the volume that it is played at.