That these are whose⁠—but whose are these?

On Friday⁠—

Lines Written by a Bear of Very Little Brain

On Monday, when the sun is hot I wonder to myself a lot: “Now is it true, or is it not, “That what is which and which is what?”

On Tuesday, when it hails and snows, The feeling on me grows and grows That hardly anybody knows If those are these or these are those.

On Wednesday, when the sky is blue, And I have nothing else to do, I sometimes wonder if it’s true That who is what and what is who.