Corn starch is a shear thickening non-Newtonian fluid meaning that it becomes more viscous when it is disturbed. When it's hit repeatedly by something like a speaker cone it forms weird tendrils. The video was shot at 30 fps and the speaker cone was vibrating at 30 Hz which is why there is no blur. This is the original video with the actual sound of the speaker.
This is a very literal take on our last two assignments. This video shows that sound's effect don't have to be solely conceptual; they can be tangible as well. Yay chemistry!