X Window System Turns 30 Years Old

An anonymous reader writes "One of the oldest pieces of the Linux desktop stack still widely in use today is the X Window System that today is commonly referred to as X11 or in recent years the X.Org Server. The X Window System predates the Linux kernel, the Free Software Foundation, GCC, and other key pieces of the Linux infrastructure — or most software widely-used in general. Today marks 30 years since the announcement of X at MIT when it was introduced to Project Athena." X wasn't new when I first saw it, on Sun workstations the summer before I started college. When did you first encounter it?