Play,’ is the language of communication between children. With no friends in his new neighbourhood, Matt finds a stick and draws in the mud, in a field near his home. What starts out as boredom, turns into a world of his own. As he builds, Matt draws the attention of another child, who helps to build his world, from found materials. This book reminds us all that imagination and unstructured play can lead to new worlds being formed. Hiebert, one of the authors, relied upon her own imagination to entertain herself, when her father was building roads into isolated communities. The watercolour and thin ink illustrations, as well as the aerial perspective of the pictures, adds to the idea of being a creator of materials. It is ideal for introducing Building Things, a grade one science topic in Alberta.