If Albert Einstein mathematical equation is right that E=MC squared, than perhaps this would be right to say that energy = physical manifestation squared or E=PM2 - which means that it would take a spirit entity twice the amount of energy to manifest itself in the physical realm to be seen and heard.
When a paranormal being draws its energy from a electromagnetic field or other types of energy that is available, it might be possible for it to appear as a white mist, dark shadow, and glowing orbs floating, dancing, and darting through the air.
