Contains 25 pages of lines and 3 sets of 25 pictures each in a flip chart. Some of the pages will cancel with red/green glasses. The difficulty level of the line pattern increases from simple straight lines that do not cross to dotted, curved lines that cross at various angles. The last 2 pages of pictures are "half-n-half" where the child is instructed to identify the two halves that match and connect them with a line. The last page of the book is laminated so lines can be drawn to connect pictures as instructed. Includes 1 washable marker.