So, all those many years ago when the builders were working on this place, I think a conversation went something like this:
"I started on the garage, boss."
"What do you mean, you started on it?"
"I went ahead and built the first doorway on the right. You know, nothing to it, standard square garage door. It's done."
"Dear God, man, the doorways are supposed to be arched! The owners have already special ordered the doors!"
Maybe the owners just never noticed the difference...