Intense harmonic vibrations can cause objects, particularly those that are plastic or liquid, to change shape to match the source of the vibrations. The discussion references a demonstration from the TV show "Big Bang Theory," where acoustic vibrations affect flour and water in a container. Different materials and conditions yield varying results, indicating that the object's properties play a significant role. The conversation also raises the question of whether intense electromagnetic vibrations at a single frequency could similarly affect matter. Overall, the relationship between shape and frequency in materials is complex and influenced by their physical characteristics.