Meaning: This sentence is similar to the first one, but it uses more formal language. It's like saying, The cat is watching something from a small opening in the wall.
Choice of Words:Feline is another word for cat. Observes means to watch or look at something carefully. Aperture is a fancy word for an opening. When you put them together, the sentence means that the cat is watching something from an opening.
The kitty is peeking out from the crack.
Meaning: This sentence is the most informal of the three. It's like saying, The cat is looking out from a small crack in the wall.
Choice of Words:Kitty is a cute word for cat. Peeking means to look out from a hiding place. Crack is another word for a narrow opening. When you put them together, the sentence means that the cat is looking out from a narrow opening.