Weathervanes, weathercocks, or wind vanes as commonly known, are instruments that show wind's direction. Their origin can be traced all the way back to 50 BC Athens (the one with the revolting Greeks). Nowadays, although still serving their function, weather vanes are used only as a decorative element. You tend to stick them on your roof and find them in your gutters after a heavy storm.
Art is merely humans` projection upon the World. As you probably experienced at some point in your life, there are a lot of crazy, bizarre, or plain weird humans. Weathervanes, as a decoration element, don't stay behind. The most are traditional ones, shaped as animals, vehicles, different sceneries and God knows what more. But then, there are weathervanes nobody could imagine practical, or worth building. Yet, somewhere, somebody said "fuck it" and decided to breach the limits of weather cock architecture.
What you are looking at is every farmer's wet dream. I'm sure there could be a lot more practical use to dispose of a tractor (spare parts and metal are sold for money or so I've heard), but who am I to give an advice. The author of the picture says it is located west of Carmen, Alfalfa county, Oklahoma on Highway 45m, which .. kinda makes sense.
I present to you, the big, weird, metal, and probably weighing 100 tonnes statue, which is actually a functional weathervane. I wish I could tell you more about it, but I forgot the source and the damn thing is impossible to find. Even reverse image Google search didn't help. That's right, Google couldn't help me find a thing, where is your God now? Instead, you can start worshipping this big piece of weather cock. As it turns out, it is hollow from the inside and is capable of turning easily even from the softest breeze. It truly is a masterpiece of the weathervane culture.
Meet the World's largest weather vane. This is actually a retired Douglas DC-3 CF-CPY plane located at the Yukon Transportation Museum. It had a long and striving career as a supply plane in cold and snowy Canada, before finally meeting the end of his serving days back in 1977. Yukon Flying Club, the owner back then, had the brilliant idea to restore it and put it on a pole, so it can forever be soaring through the cold Yukon winds. If you don't believe this 8,000 kg beast can turn by mere wind, here is a video of it in action. Having this to show you the wind direction surely out balls your neighbour's copper rooster.