[rcxdude]

The point is that it's distinguished by a lot more than just color. Shape, positioning, texture, etc are all used to seperate functionality (which is a hard-earned lesson in aircraft: there have been plenty of accidents because a pilot confused two similar levers/buttons/etc - one famous example was the lever to raise the landing gear being next to the throttle, which resulted in more than one case of it accidentally being raised while landing)