Observational Skills, Or Lack Thereof

We've been living in our new house now for over a year, yet it wasn't until a few weeks ago, when cleaning the bathroom, that I noticed the taps didn't match! For those of you with similar observational skills to me, the tap on the left has a squared end whilst the one on the right is rounded.

We've had a fair number of guests/visitors over the year but I've yet to find anyone else who has noticed that they don't match. I'm guessing that given they work no one has really looked too closely at them.