The visual language of the titles is based on the aesthetics of the movie. The main character is a writer. You often see letters on the screen (Theodore writes them himself, and Samantha reads his mail and even helps him publish his book).
Press space bar to start a drag.
When dragging you can use the arrow keys to move the item around and escape to cancel.
Some screen readers may require you to be in focus mode or to use your pass through key