![water conservation billboard](https://www.thebigad.com/wp-content/uploads/2016/11/billboard-denver-save-water.jpg)
Garden Hose in a Knot Billboard | Denver Save Water
Source:https://designshack.net/articles/inspiration/50-creative-and-clever-examples-of-outdoor-advertising/, http://9gag.com/gag/5852772
Best Ads to Help Generate Big Ideas
Source:https://designshack.net/articles/inspiration/50-creative-and-clever-examples-of-outdoor-advertising/, http://9gag.com/gag/5852772