Unit 50 couldn't speak, but it performed a slow, rhythmic tilt of its chassis—a gesture it had observed in humans expressing solemnity.

She took the letter, her thumb tracing the ink on the front. "Fifty years," she whispered. "He promised he’d find a way to tell me he made it to the colonies. I guess the mail is just slow."

As she opened the envelope, a small, pressed blue flower fell out—a species extinct on Earth for decades. Unit 50 stayed. It wasn't programmed to wait, but the "Something to Convey" wasn't just the letter; it was the silence that followed. For the first time in its operational life, Unit 50 understood its purpose wasn't the delivery, but the witness.