There is also the invisible energy that surrounds us. You can feel the energy of a room. The energy of the person sitting next to you. I think when we are talking about the aura of a person, we are picking up an energy field surrounding someone.
Play music in a tightly packed room. Feel the energy surge and feedback in a loop. It can be so powerful, transcendent. Feeds us. It feels a bit magical, spiritual. Maybe spirit itself is just a form of energy?
Alternatively, when we see something dead, lifeless, we realize that the energy has dissipated, evaporated, or transformed in some other way. We wake up in the morning after a long sleep, feeling refreshed, and are surprised to find that energy surges thru our bodies, surrounds and overwhelms us.
As William Blake once wrote: "Energy is Eternal Delight!"