Sometimes it's important to undergo construction work for the sake of your animals. You might want to install a baby gate so your dog doesn't go upstairs, you might want to install a cat flap in your door, or you might even want to build a circular kitty door! That's what this person did, and they didn't think they needed the help of a contractor to bring this vision to life.
Although their kitty door idea is one of the coolest things ever, their DIY skills weren't exactly perfect. Unless they have a cat that can jump extremely high and has perfect aim, too.