"It's Alright with Me"

I was thinking about "It's Alright with Me" yester-day and realized that the line "I got a leak in my bucket and a great big hole in my floor" contains a sort of merism.  The "leak in my bucket" implies a small hole, and this contrasts with the "great big hole."  Naming these two opposites indicates the variety or range of ways in which the narrator is "a man that's poor."