alternating the different pages, wide, narrow, wide, narrow (etc.), and then binding them together. Images of one type, black and white for instance, are drawn on every set of facing pages with narrow on the left and wide on the right. The alternate set of images, color in this example, are drawn on the alternate sets of pages with the wide page on the left and narrow on the right. The result is a series of alternating images on sets of facing pages. To perform the trick, the book is held by the binding in one hand and riffled with the other; for right handed magicians this will normally mean the binding is in the left hand and the riffling is performed with the right hand. By carefully grasping the right side close to the edge, the fingers or thumb are only touching the wider pages, so when the book is riffled two pages flip each time, the wider page under the thumb, and the narrower one on top of it. This way the audience is always seeing the face side of a wide page and the back of a narrow one. To complete the trick, the book is simply riffled with the right hand inverted, or more commonly, by rotating the entire book around its transverse (horizontal) axis while the audience is directed elsewhere. This causes the upper side of the narrow pages to display along with the back of the wider ones. Images drawn on alternating pages are thus shown or hidden depending on where the thumb is placed. More complex versions of the same basic concept can be used to have multiple sets of pages with different images. In these cases the pages are wider or narrower in a pattern along the entire length of the outer edge, creating a number of "hot spots" where the book can be riffled to cause different pages to appear. Hocus Pocus creates a similar concept by using small pieces of paper pasted to the pages to create the same effect, allowing the magician to grasp the tabs while they riffle. This version allows any number of pages per flip, the Pocus version using sets of eight pages. References Citations Bibliography External links Magic Coloring Book Revealed Magic tricks