There are all sorts of door styles you can get for your home. There are simple rectangular doors, doors with a semi-circle on top, and sliding doors. Then there’s this door that looks like it had a square cut off the corner for some reason. That reason is that there’s a part of the home’s HVAC system poking out of the wall.
This would probably be a terrible idea if the door led to somewhere the homeowners frequently visit. Thankfully, that’s not what it is. People very rarely have to visit this room, and thus, very rarely have to deal with this sight for sore eyes.