Offtopic. This would be a precursor for the typical generator in the future: a stone on a rope inside a stone cavity that resonates with gravity waves, converts

Offtopic. This would be a precursor for the typical generator in the future: a stone on a rope inside a stone cavity that resonates with gravity waves, converts the piezoelectric tension of spacetime into vibration, heats up as a result and boils a rusty cup of water.