WTH? There are early 2000s built houses here that have weird carpet nooks like that, just a bit bigger. Still looks dumb. I just don't get it. Either square it off and make a decent sized space out of it already or just get all one type!
Wha? It looks like there was a piece of furniture on the carpet next to the bookshelves. Maybe the husband didn't want hardwoods and the wife said fine, here's your carpeted part, put your chair here and stop bothering me. lol.
It's not just the totally weird flooring, I don't get the layout of that room in general. What the fireplace seems really oddly placed. Is it a family room?