I support this alternative use for the written word. Artist Bronia Sawyer has a way of blending shape and color to make ethereal works of art. A book is a set or collection of written, printed, illustrated, or blank sheets, made of paper, parchment, or other various material, usually fastened together to hinge at one side. A single sheet within a book is called a leaf, and each side of a leaf is called a page. A book produced in electronic format is known as an electronic book .