A beautifully conceived and rendered book with no words, but only paired digitally created illustrations on facing pages of situations that symbolize before and after. Most of the pairs are from nature, e.g. a caterpillar and a butterfly, a chicken and an egg followed by an egg and a chicken, but many also reflect the transience of man and his buildings, cities, etc.  This is a lovely book to leaf through on a winter night, full of the color and exuberance of the natural world.