The diagrams assist in ease of understanding. A high priority is given to being able to complete each project without special tools and materials. The cost of each project is low. Only low cost and no cost materials are needed. The projects are made from such things as small pieces of wooden boards, coat hanger wire, paper, used containers, discarded household items and common items found in most hardware stores.
Most projects require one or two common tools such as a scissors or hacksaw.
It is an aid to anyone who wants to develop ingenuity to use the tools and materials that happen to be available.