Technical innovation: Sound begins and ends when the flaps are opened. Children love sound books, but the noise can be distracting for parents during reading time. Here comes the solution. In this lovingly designed board book, the sound is only heard when it fits the story. What's happening today in the blueberry forest? Aha, Daria the badger is building a house. How exactly does that work, and what do diggers, concrete mixers, and the like sound like? Little construction fans will discover this by looking behind the die-cut flaps. A wonderful interactive listening experience for children aged 18 months and up.