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His longtime partner Sierra Dall confirmed his death toThe Hollywood Reporter.He was 90.

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From his work with JPL and NASA, Cantwell moved onto film.

In that same Reddit AMA, Cantwell lays claim to creating the first real color monitor for Hewlett Packard.

And yet his UI designs forWar Gameswere mostly monochrome.

He designed the Death Star and, as he put it, gave it its trench.

The Death Stars trench was actually a happy accident.

It would have taken a week of work just to fill and sand and re-fill this depression.

So, to save me the labor, I went to George and suggested a trench.

From there, the trench run was born.

Great design, kid.

That was one in a million.

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