Charles Simic is a surrealist poet which means his poetry can seem extreme or unreal. He was know for writing poems about objects, like a fork.
It is definitely not a sonnet because sonnets have 14 lines of rhymed iambic pentameter. This poem is a free-verse poem. We know this because it has no set rhythm or rhyme scheme. Free-verse was made possible because of the poetry of Walt Whitman.