The NeWS Postscript-windows-on-Sun’s terminal emulator could run with a 1-point font. On a typical display of the time, which was about 75ppi, this meant that you either had a black pixel if there was a character or a white pixel if there wasn’t. It was surprisingly useful - instead of turning a terminal window into a static icon when you minimized it, it turned into a window with 1-point fonts, so when things changed on the screen you could see that something was happening.
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