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A simple but fascinating indicator from yesterday. A grid interrupts electrons bombarding a phosphor coated cup, opening or closing the eye. This one shows the eye fully open.

A simple but fascinating indicator from yesterday. A grid interrupts electrons bombarding a phosphor coated cup, opening or closing the eye. This one shows the eye fully open.

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I seem to remember that LED one.

Eyes are still available, if somewhat expensive. Hopefully that will give this tech time to mature.