Sound sculpture

I opened both side of a can and attached it to the air hole of my subwoofer with masking tape. Stretched a piece of food wrap on top of the can. The 80Hz low frequency sound vibrated the food wrap and the liquid on the food wrap jumped up as soon as the vibration started. The liquid was milk with icing colors used in my four color crown.
The viscosity looks higher than normal in 3 of the 5 photos here because of the following possible reasons:
1. Evaporation over time - I did this project for 3 days.
2. I captured the earliest moment of the vibration.
3. Soft lighting.