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I enjoyed the history portion of the article. I'd never went to put myself in a situation where something electronic malfunctioning prevents me getting to something I need to. If I need to see who is coming and going I'd use a camera. I cant say my opinion wouldn't change if it concerned a business and the people coming and going werent just friends and family.
Yeah, it's fun but its also a thin retelling of the wikipedia page. Even digging in a tiny little bit gets you to more interesting stuff. Ismail Al-Jazari was a badass. His book of "ingenious mechanical devices" was basically everything Western civilization would take credit for for the next 600 years all couched in terms of cool party tricks you could pull off for the Sultan.