A Lighthouse on the Great Lakes
![](https://www.obsev.com/wp-content/uploads/sites/2/2020/12/5c668b72bbfdd_EgXFAcd__700resize.jpg)
This lighthouse is off the shore of one of the Great Lakes in the United States. Notice how the waves form a circular pattern around the structure and flow out into the ocean around it. This structure helps sailors navigate their way in the water at night without crashing.