The cat goes on little fog feet
The indoor cat who has had a (brief, unsanctioned) taste of outdoor life spends a day scratching at screens and voicing his discontent beside doors through which he cannot pass, and then, with a sigh as evening falls, returns to the world of food dish and water bowl.
We shall have to watch the doors carefully a while longer, though. Especially that one, which did open for him, just once, when the slightest crack appeared to let a paw through.