NobleGundam
Banned
Isn't it just hard light? (Not a metal). I think that's what they call it. Forerunner were able to manipulate this material to build pretty much everything apparently
And it's not static. In one of the books I'm pretty sure they talked about the Didact's ship changing or transforming because it was made of the material
So from A.I. to Structures and Space Ships they're "Solid Vision are interactive holographic projections"