Because I think of it as a mode/setting. I don't know if this is the best explanation but I thought of it like the rear view mirror of a car that is adjustable for either Day or Night driving.
http://www.kiopman.com/images/books/4/3/page.h41.jpg
Plus, I also found this picture lol:
https://f4.bcbits.com/img/a1682650412_16.jpg
Then we two companions stayed in the ocean
After five days the currents separated us.
