It looks like any ordinary keyboard. You know, the kind you will hook up to your PC, so you can draft that manuscript, type up that code, or move your character around in your favorite video game. Except, the Raspberry Pi 400 is a keyboard that houses a full-fledged computer inside that reasonably slim keyboard enclosure.
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https://www.coolthings.com/raspberry-pi-400-dual-display-keyboard-computer/