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People in the past had a lot of weird technologies, trickery and magician stage plays. I don't think a laser pointer would be out of the ordinary, unless you'd try to explain what it actually is. I can imagine people would just assume it's a trick.
Now, a cutting laser... That could be interesting.
But I wonder how people in the past would react to stuff like audio and video recording and immediate playback. I always thought that is something that screams "impossible" unless you're already familiar with it.
Audio/video technology came to mind for me too. There's so many layers of technological development to get to even the most basic A/V displays. And even more to have something to play on it. It's sure to amaze or terrify some people from ages past. Similarly, navigation. Through something like a smart phone, it would probably be baffling to the brightest minds of the early 20th century, let alone centuries ago
Ooh, that's a good one (recording).