This children's book is about a man, called Plip/Plitsch/Ploc, who decided to turn into an umbrella. Protected from the persistant rain he could live on his own without getting wet. But he felt lonely until he met a woman very similar to him. Now their umbrellas were in the way ... It's a very metaphoric book about self-defense, doubt, love and confidence. To emphasize the inner life of Plip Thomas Baas worked only with cool green tones, black and a warm red. The publisher recommends this book for children aged 3 to 8 years, I would say it's actually for people aged 3 to 80 years.
Take a look at "Kleine Hausgeister" as well.