You’re a more generous reader than me if you think this is illuminating: > Rather than recoiling in space, the light would recoil in time, precisely retracing

You’re a more generous reader than me if you think this is illuminating: > Rather than recoiling in space, the light would recoil in time, precisely retracing its tracks, like the Ping-Pong ball returning to the player who last hit it. Because to my mind, a ping pong ball returning to the player who last hit it seems like something I would describe as ‘recoiling in space’, not ‘recoiling in time’. Returning stuff back the way it came is actually a thing people associate with ordinary mirrors - so if you’re trying to tell me how a time mirror differs from a normal mirror this ping pong ball metaphor is not exactly helpful.