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Although there was a recent remake by George Clooney, when we talk iconic, we mean the 1964 movie. The premise is that most of the United States defense system is automated and the movie is mostly about how the humans try to hold back the end of the world. While no individual computer is, itself, iconic in this film, the SAC (Strategic Air Command) showcases the computer's steps leading to destruction. Great fun is had by all.
While technically not a massive, government datacenter, perhaps no insane, over-the-top, sentient computer is more well-known than the HAL-9000 (Heuristically programmed ALgorithmic computer). HAL is nuts. HAL is nuts, and yet -- we will always love him.
THERE IS NO SANCTUARY!!!!!!!!
In 1976, your esteemed gallery author was 15 years old, Micheal York was astonishingly young, and the idea of everyone over 30 going to "Sanctuary" with the help of the Sandman central computer seemed both fine and reasonable.
Your gallery author is now almost 50 and sometimes thinks we need a reverse-Logan's Run to keep the young whippersnappers out of our hair.
So there. Get off my lawn!