We read the Eric Carle book Hello Red Fox for our author study, and as usual the children loved it. It is a story of a birthday party that shows that things are not always what they appear to be. This book is filled with characters that change colors before your eyes--a green fox turns red, a yellow butterfly, purple, and many, many more. It uses an optical illusion phenomenon called complimentary afterimage Here is a link that explains what is happening and why we see the opposite colors when reading the book.
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