You are giving energy a quality it does not have by calling it 'illusory'. 'Illusory' does not mean 'not solid'. Air is not illusory, nor is the food energy locked up in my dinner, nor a beam of light. To be illusory, we have to have a mistaken understanding of its true nature, so the 'illusory' aspect is really a state of mind relative to actuality - its not an intrinsic property of a thing like its mass or length or for that matter, energy content.Originally posted by Mr. Robin Parsons
And not all that easy to describe/define, aside from that, the "illusory" is in respect of the idea of "solidity" inasmuch as the 'solidity' (of reality) is constructed from that/those "illusory" element(s).......energy.
Some physicists might argue that energy is, if anything, the only thing that is real, although that's a bit too reductionistic for me.