When a book and a head collide and a hollow sound is heard, must it always have come from the book?

When a book and a head collide and a hollow sound is heard, must it always have come from the book?

当一本书和一个头碰撞，听到一个空洞的声音，它一定总是来自这本书吗?

-- Georg Christoph Lichtenberg 利希滕贝格