Question

The yellow fog that rubs its back upon the window-panes,
The yellow smoke that rubs its muzzle on the window-panes
What literary device is most clearly used in this passage?

Answer 1

Personification.

Rubs is the key word because smoke can't really rub things like a human, so it's personifying human behavior.

Hope that helps!

:D®

Answer 2

The answers is Imagery (APEX)