There is a gravity hill in New Zealand on the road between Wanaka and Queenstown. There is no view of the horizon as described in this article. What makes it ev

There is a gravity hill in New Zealand on the road between Wanaka and Queenstown. There is no view of the horizon as described in this article. What makes it even more interesting is there is a stream besides the road that appears to be flowing up hill. My wife and I couldn't understand what was happening for the longest time, but I ultimately put it down to some sort of optical illusion. Interesting to hear there is a name for this phenomenon.