Nothing Is in Constant Rest.

Felix narrowed his eyes in focus on the flame, wanting to control it through its frequency. Though, Felix understood that fire did not have a frequency in the traditional sense.

The fire was a chemical reaction (combustion) that produced heat and light.

It was more accurate to control the frequency of the light that the fire emitted.

If he considered a common yellow flame, the frequency of that light was roughly around 510 THz (terahertz), which corresponded to a wavelength of about 590 nm (nanometers).

He understood that this was a rough estimate, and actual values could vary, but imagining that his mind could pinpoint the exact frequencies of each object, energy, or such, allowed him to pinpoint it and control it.

He could feel the vibration, the frequency of the fire, humming in his veins, intertwining with his very essence.