Why do sofas come in three sections, but not more?

Posted under sofas

When sofas come in two sections, they are called love seats, and when they come in more than three sections, they are called sectionals, but the sections are separate pieces. Why aren't there sofas that come in four sections, for example?

There are four and even five section couches though these days you would probably have to special order them. The three section couch became popular because it was a middle ground. Not to big for most rooms, and easier to move, it was more versatile. Today it has become an industry standard for those very reasons.