From a conversation I was having with a friend yesterday:
The passing of Leonard Nimoy today, although not completely unexpected, still has major ramifications for people of our age and intrests. In many ways he, and a few others provide the cornerstones of imaginations, those very imaginations that were being kindled by the books we read, the films we watched, and the TV shows that gave us our escapes. When one of those figures goes, it is like a light from our past grows dimmer. But just for a moment because, in this instance we know all those shows and films are still there, can be watched again and again; may one day evoke the sense of wonder in our children as they did in us. Nimoy may be gone, but the character he made live, Spock, will most surely live long and prosper.
"He's not really dead, not as long as we remember him." Dr McCoy, The Wrath of Khan
Seemed quite fitting.