Yeah. I completely understand what Max Planck was talking about when he suggested that black body radiation comes in discrete packets. I get there this way: heat is energy. Heat from a hot stove element is energy "radiating" through space; this radiative heat does not require a medium, this is pretty obvious because it gets to the surface of the earth from the sun. We also are reasonably certain, nowadays, that this "form of" heat is photons of infrared radiation. What do you believe infrared radiation is?