Finally, the Art Director Gives Mark an Illustration of a Yellow

Finally, the art director gives Mark an illustration of a yellow pencil.She tells Mark that the pencil artwork is a repeating theme in the book, one that will be used as a pointing device to draw the childrens' attention to various items on each page.She says that the pencil artwork will take on different shapes when it's used - some times it will be curved, sometimes straight - it could even be S-shaped.At other times it might stretch across the entire page.Mark says he will use which type of brush to manipulate the size and shape of the graphic?