As we move further into the analogies between solvents and frequencies, we come to the issue of light.
Do we call those frequencies that are perceivable by our sense organs "light" when in fact, we are looking at "light" with organs made of light? In some way, our position in time-space may, in fact cause us to eclipse our own ability to perceive reality objectively...we can't remove ourselves from the equation.
Focal length can be used to bring an image into focus, but can it not also be used to set things aflame?