Minecraft wiki entry for Recipe_book, associated text: Clicking on an item in the list displays its recipe in the grid. The item can then be crafted if the materials are available; otherwise, the button containing the item is highlighted red. Each click shows alternate patterns for the same crafting recipe, if there are several patterns (for example, each click on a banner crafting recipe shows all the possible banners using different colored wools). Right-click on the item shows all the alternate patterns.