5,406
edits
Line 16: | Line 16: | ||
**Balls | **Balls | ||
*Vibrations | *Vibrations | ||
* Acoustic, using sound waves | **Acoustic, using sound waves | ||
**Vibrations using shakers | **Vibrations using shakers | ||
* Thermal, like steam or burners | * Thermal, like steam or burners |
edits