The finger probing the rectum is the toy monkey hanging over the crib with the word baby sewn into its stomach.
The woman's hand on the man's shoulder is the nylon cord which helds the monkey to the yellowed wall paper.
The tongue inching across the throat is the factory worker moving rolls of wall paper and glancing down at the word Hand on the shipping-bill in front of him.
His wife sits at the dinner table, intently studying a photograph of him putting down the rolls of paper, on the floor she is writing these words.