• Solidity is a matter of degree. For example, glass. It seems a solid, yet it still flows, very, very slowly. If you were to examine glass that has been in a window for hundreds of years, the bottom will be measurably thicker than the top. It is consistent in the amount of thickness per the amount of time it has existed. So it is not a matter of someone making it that way.
  • I don't think it's really true that everything's made up of light. Light is made up of photons, which are one of the elementary particles. Other elementary particles are things like quarks, leptons and bosons. All particles up to atoms & molecules exhibit wave-like behaviour and particle behaviour, and it seems to be that the less mass something has, the more like a wave it behaves, and the more mass something has, the more like a particle it behaves.

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