Reminds me of an awkward moment dad had early on. He'd been reading textbooks with big thrust/drag/lift/weight arrows for so long that he was startled during a

Reminds me of an awkward moment dad had early on. He'd been reading textbooks with big thrust/drag/lift/weight arrows for so long that he was startled during a takeoff that he couldn't see them in reality. Despite studying engineering, he hadn't quite reconciled himself to being kept alive by invisible forces.