Students in Mrs. Wilson's fourth-grade classroom watch in anticipation as the guest teacher, Ms. Davis, demonstrates binary signaling using a lightbulb that flashes when she holds it in her hands. She challenges them to guess what she is trying to "say" while making the lightbulb flash on and off, explaining that the lightbulb stands for…

This book explains methods of representing information. Contents are divided into six chapters: (1) "Appetizers" includes activities that can be done individually to become familiar with the topics of signs, symbols, and codes; (2) "Concepts" provides a basis for symbol and sign development; (3) "Activities" features activities and classroom…