Recently our cat developed an annoying new habit. She's usually is asleep in the study upstairs when we go to bed. But in the middle of the night she wakes up and wants to go outside. Unfortunately the closed living room door is in her way, so the can't get out. She found a solution for this problem; start making noise in front of our bedroom door until someone comes out and opens the living room door for her.
After a week of getting our sleep interrupted every single night, I decided to cut a hole for her in the living room door. As you can see, the shape is inspired by her as well. It took some getting used to, both for us and for the cat, but we can finally sleep without interruption and the cat can go in and out whenever she pleases.