With the active help of the reader, Little Frog shows Mama Frog how to see the animals in their more familiar colors. Is it magic? No, it's a remarkable function of the human eye. As Little Frog demonstrates, anyone can do it. Small readers will enjoy taking part in the fun of changing the colors of the animals. And they will laugh at the effect they themselves can create at the end of the story when Mama Frog gives Little Frog an embarrassing birthday kiss!

Eric Carle believes that learning should be a joyful experience. In this imaginative book he invites young readers to discover complementary colors while enjoying the amusing story of Little Frog and his colorful friends.


Goethe (1749-1832) is celebrated as a great German poet, novelist, and philosopher. But in his eyes, color theory was his most significant achievement. In 1810 Goethe published Farbenlehre, naming three primary colors--red, blue, and yellow--from which all other colors could be made, and claiming that each color had an opposite, or complementary, color. But how does this relate to well-loved artist Eric Carle's Hello, Red Fox? Well, it's like this. On his special birthday, Little Frog's friends--Red Fox, Purple Butterfly, Orange Cat, and others--begin to arrive at his house for a party. Imagine Mama Frog's surprise when she perceives Red Fox as green, Purple Butterfly as yellow, and so on. Each time, Little Frog gently points out that she simply hasn't stared at each animal long enough to see his or her "true color."

At the beginning of the book, readers are instructed to stare for ten seconds at the boldly colored animal on the left side of the spread, then transfer their unblinking gaze (more like glaze at this point) to the blank white page on the right. If they do that successfully, a shadowy image of the animal appears in its complementary color! Young kids may think this is magic, but actually the phenomenon taking place between the eye and the brain is called "simultaneous contrast after-image." No matter what you call it, it's amazing and fun to behold! The story itself is simple and deliberately repetitive, appealing to very young children, but the optical illusions will be a hit with all ages. Carle's bold collage illustrations are perfect for this playful spin around the color wheel, which ends with the green Little Frog turning red when Mama Frog kisses him in front of all of his friends. (Ages 4 to 8). Karin Snelson