Observation:
High-voltage low amperage electric arcing through air ..the effect of a first static electric discharge causes a second lesser arc with what seems like no input.
During the electric arc, charge is lost (light, sound, thermal radiation) while the remaining charge is preserved during the exchange of polarity (directional flow) between conduits.
The electric charge preserved during the polarity inversion is then available to cause a second static electric surprise going back from whence the charge came.
It is almost as though there is a transparent wall between two pendulums, when the first pendulum meets the interference of the wall ..the energy that is transferred to the pendulum on the other side of the wall (mind's eye) ..in reality this exists as a lesser arc going back from whence it came.
On the scale of imaginary numbers this looks like quantum waves reflecting back after having tunneled through air to arc into the object that is reflecting waves and shocking me to a more intimate understanding of matter and energy.
The electrical properties of interfering conditions have created a frequency, one cycle per two discharges/arcs. Without using technology nor prior intent.
..perspective.