These two pictures show how some people attempt to keep intruders out. Nice, huh?! They used to put broken glass on walls in the UK when I was a kid, but it was later outlawed. I've never seen nails used before but perhaps that's because of technological advances in the last 50 years. It looks to me as if the glass and nails have been bedded into epoxy resin. And if that is so then epoxy must surely be cheap here in India - potentially useful knowledge for any future little projects I might have...
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