A fantastic concertina book that serves as a height chart and a measuring tool to help curious kids get excited about mathematics and measuring. It can either be hung on a wall or kids can take it around the house filling in the activities on the reverse; what’s bigger – your teddy or a box of cereal? Your mum or your bathtub? Weight and volume are also explored. With big, bold illustrations and immaculate design and packaging, this is both utilitarian design and practical math in action.