This book is called Three Citations, which comes from the first work of the Three Citations Competition of Wuhan University. It's a classic at first glance.
List many impossible things one by one, and the last one "You are thinking of me" is possible. It can be understood in reverse. I'm peeling crabs, I'm writing a notebook, maple leaves and snowflakes fall on my head, and I miss you, which makes sense. The list of intentions is that you can't miss me until the world is upside down. It means: only when the world is upside down will you fall in love with me and express your helplessness and feelings about love.
Hope to adopt