Level 4 Laying Out Your Background

In the Challenge section of the Instructions it says, “Can you use variables or randomNumber() to add some subtle animation to your background layer?”

Wouldn’t that be “variables and randomNumber()” since a shape would need to be created as a sprite variable in order to use the randomNumber() command?

I’m asking because it seems like using both shapes and text isn’t addressed in the same way sprites have been and I’m wondering if there is something that I don’t know.

Thanks for any help!