What we see are photons of light, and in the physical universe this is the form light takes. Even light must take on form to exist in a material world, but this form is more subtle than normal matter, having no rest-mass whatsoever.
Photons are carriers of vibrancy, or vibration, throughout our universe.
The nature of a photon is rather curious. The more energy they contain, the smaller they are. This relates to their wavelike nature. Radio waves, for example, are comprised of photons which can be meters, or kilometers, long. Microwaves are in the centimeter range.