"Theo," he heard her say again, but he couldn’t break his focus on his newest invention. A time turner that would allow a person to go back to an event and observe without actually being able to interfere with the timeline. Slightly the same as viewing a memory, where the traveller wasn’t able to interact. They would instead be able to go back and just watch as history played out before them. Thus far, he’d managed to travel back a month and was able to view the holiday he and his family had gone on.