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A dog jumps into Lake Banyoles in northern Spain.

National Geographic photograph by Tino Soriano

This and other blue images appear in LIFE IN COLOR, a 504-page book of 245 photographs divided into color chapters. The book is available at Amazon.com. To view a range of blue images, visit the National Geographic Blue Gallery.

A person can learn a lot from a dog…Marley taught me about living each day with unbridled exuberance and joy, about seizing the moment and following your heart. He taught me to appreciate the simple things — a walk in the woods, a fresh snowfall, a nap in a shaft of winter sunlight. And as he grew old and achy, he taught me about optimism in the face of adversity. Mostly, he taught me about friendship and selflessness and, above all else, unwavering loyalty.” JOHN GROGAN, author of Marley and Me