Seeing things

Many career moves ago I found myself working for a firm that built firing systems for tanks used by the British Army. The interface my colleagues had designed has long stuck in my mind as a paradigm of simplicity. Consisting of a TV image of the target area, a targeting cross-hair that could be moved by the gunner using a joystick, and a large red switch that fired the shell, it literally could not have been easier to use.

Naturally, there was more to the system than this. Ballistics (which

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