Cats are highly social animals and spend most of their waking hours interacting with available animals and playing. Still if a cat isn’t able to go out and about it will ‘explore the house it lives in. Cats are into everything. A houseplant is an excuse to play with the leaves and an open box is an invitation to climb in. Cats love to edge their way into exciting places.
Everything new which comes within the cat’s orbit has to be examined, on the outside and, if possible, the inside. Having checked that all is well, does the cat then feel it can relax and wait for its owner to come home? Who knows what goes on in the mind of the cat?