When we started looking for a 2nd cat I knew I wanted one that looked like B – just the right shade of orange brown with tiger stripes.  I didn’t even consider taking home a black and white cat, despite the fact that my boyfriend was hoping for one.  It’s not that I don’t like other styles of cats.  All cats (well, most) are beautiful in their own way.  This issue is really about symmetry.  It would be jarring to have two clashing cats in the same house, and I believe a lot of other people feel the same way.  In my circle of friends, several have a matching pair of pets.  One friend has two long-haired cats that are very similar looking even though they aren’t the same color.  My other friend has two short-haired cats with athletic builds.  I’ve had two dogs that are siblings, and we’ve all seen the people walking down the street with matching white terriers.   After observing this phenomenon in our environment, we can (anecdotally) say that this is a statistical trend that should be investigated further.