Every cat, or most cats I should say, like to smell humans, get their scent and mark it. When Kiki and Koko moved in with us, we did not have a shoe rack and as people would come in, they would pile up sneakers and shoes around the hallway. After seeing what Kiki and Koko do, we decided to keep the shoes outside of the apartment. It is so cute how my tiny kittens used to be as small as the sneakers in the hallway. Ah, I wish they could have stayed that small forever.