I later realized that I constructed this definition so restrictively (insofar as it makes sense at all; I’m still tightening down exactly what I meant) that the only thing that potentially qualifies is the universe itself, the electromagnetic field and everything that it carries.
I later realized that I constructed this definition so restrictively (insofar as it makes sense at all; I’m still tightening down exactly what I meant) that the only thing that potentially qualifies is the universe itself, the electromagnetic field and everything that it carries.