Spacetime Engineering

The practice of designing structures or systems that account for or exploit the curvature of spacetime, which is either extremely advanced physics or a really fancy way of saying "building things that work in gravity." In practice, spacetime engineering means accounting for relativistic effects in GPS satellites (they'd be useless otherwise), designing experiments to test general relativity (dropping things from tall towers, basically), and theoretically, one day, maybe building a wormhole (good luck with that). It's engineering at the edge of known physics, where the safety margins are unknown and the building codes haven't been written yet.