Transhumanism in Lovecraft

After what he had told, I could scarcely imagine what profounder secrets he was saving for the morrow; but at last it developed that his trip to Yuggoth and beyond—and my own possible participation in it—was to be the next day’s topic. He must have been amused by the start of horror I gave at hearing a cosmic voyage on my part proposed, for his head wabbled violently when I shewed my fear. Subsequently he spoke very gently of how human beings might accomplish—and several times had acc...

 Matrioshka Brain Simplified

"Take all the planets in a star system and dismantle them," she explains. "Turn them into dust – structured nanocomp, powered by heat exchangers, spread in concentric orbits around the central star. The inner orbitals run close to the melting point of iron, the outer ones are cold as liquid nitrogen, and each layer runs off the waste heat of the next shell in. It's like a Russian doll made out of Dyson spheres, shell enclosing shell enclosing shell, but it's not designed to support human li...