What is Rex Hiding? Is a predictable book that takes children on a guessing adventure to see what item Rex is hiding next! These items feature shapes, colors, patterns, sequences and repetitive phrases that keep children engaged, excited, and able to be an active participant in the reading experience. Particularly, the shapes and colors within the book help reinforce early learning fundamental concepts. The events in the story can be used for further sequencing activities, asking and answering "wh" questions, and story re-tell, emphasizing auditory skills and development.