Although the purpose of pencil sharpeners is to sharpen pencils, they come in three distinct forms. First of all, there are wall-mounted, hand-cranked models. Secondly, there are electric pencil sharpeners that sit on top of a desk or table. Finally, there are handheld pencil sharpeners that can be kept in a drawer, pocket, or student backpack. When it comes to handheld pencil sharpeners, there are two basic types: 1) Those that catch the pencil shavings, and 2) Those that don't. Pencil shavings can make quite a mess and so the type of handheld pencil sharpener which catches pencil shavings is preferable to one that doesn't. In fact, when using a pencil sharpener that doesn't catch the shavings, it is necessary to use it above a trash can or other container in order to avoid making a mess. All that being said, there are many interesting designs when it comes to handheld pencil sharpeners. Many of these are shown in the video for this song!