Each important function is supported by many elements Important basic needs such as water, food, energy, and fire protection should be served in two or more ways. Bill Mollison, Introduction to Permaculture safety
Eyes on the street You can’t make people use streets they have no reason to use. You can’t make people watch streets they do not want to watch. Safety on the streets by surveillance and mutual policing of one another sounds grim, but in real life it is not grim. The safety of the street works best, most casually, and with least frequent taint of hostility or suspicion precisely where people are using and most enjoying the city streets voluntarily and are least conscious, normally, that they are policing. Jane Jacobs, The Death and Life of Great American Cities To deter crime safety
Without effective eyes to see, does a light cast light? Street lights can be like that famous stone that falls in the desert where there are no ears to hear. Does it make a noise? Without effective eyes to see, does a light cast light? Not for practical purposes. Jane Jacobs, The Death and Life of Great American Cities safetylight
No Smoking What's that big electrical cord that also connects the ship to the dock? It's not a power cord to run machinery aboard ship; it's a grounding strap, to prevent sparks from static electricity. Something else you're sure to notice on a tanker is a big warning sign about the fire hazard. Frederick Allen, the editor of American Heritage of Invention & Technology, has remarked that all tankers seem to be named No Smoking. Brian Hayes, Infrastructure: A Guide to the Industrial Landscape seafaringnamessafety
The navigation is our property RENE: Tell me what we have. Of value. GAEL: Whatever we've bought in cargo so far. I don't know what you want me— RENE: Anyone can buy goods. What do we really have? What do we sell? GAEL (realizing): The route. RENE: Yes. The navigation is our property. To copy a man's route is to steal it. Into the system of flight navigationownership