As evidenced by cave paintings, humans have been inspired by nature since the dawn of time. While lightning makes for amazing photographs, and japanese prints capture the awe-inspiring power of tidal waves, few of nature's forces are as subtly powerful as the rainbow. It's hard to imagine a world without the palette rainbows provide us. While 1940s movies are certainly cool to look at, living in one would be dull indeed. With that in mind, here is a collected assortment of rainbows caught in their understated beauty for your viewing pleasure and inspiration. Enjoy!