The human body is an amazing machine; learn how it works with this interactive lens book from Sassi Science. This book comes with a magic three coloured lens that allows you to discover three different things in each scene. Move the red lens over a page in the book, and it will focus on one body system – for example, veins. Look through the green lens, and suddenly you are exploring a totally different system (e.g. the oxygen exchange) in the same image – magic! Explore and observe, just like a scientist, to discover the many hidden secrets of the body! The book is 30cm by 22cm with a hardcover and a special storage space for the lens. Age guide: from 6 years.