King Size Mattreses

There are in fact two different kinds of king size mattreses. There's the regular King, which is sometimes called the Eastern King, and there's the California King.

The California King is longer than a regular King mattres, so it's specifically for taller people. However, the thing that doesn't make sense is that the California King is not as wide as the regular King. What's up? Tall people should also have at least as much width as shorter people. Why do tall people need less lateral space? Doesn't make sense.

I guess the Calfornia King must have been designed for tall skinny people.