Chernobyl nuclear power plant (npp). In front of the 4th reactor. Wind in plastic. Building site. Sound recoded in ms (not encoded). More info on www. Felixblume. Com.
This was a battery-powered train car running in circles on its plastic track. Is the sound pleasant? no. Did i hold my zoom h4n upside-down in the center of the circuit so the engine slowly pans from ear to ear? absolutely.
The sound of a upvc front door opening and closing. More of a slam as i let go of the door to shut it. No attribution needed at all, free to use on anything. Feel free to comment :).