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Highlighters are useful tools: you can use them to mark dates on a calendar, parts of the relevant text in a book or any other use where you need highlight something on paper. Thy influenced our lives so much that we can even find them in some computer programs. Read more about history of highlighters.
Crayons in their early forms appeared in ancient times but we started using them in 19th century as art mediums. Today they are used by children but are still important in art. Read more about history of crayons.
Pencil practically cannot be used without some kind of pencil sharpener. Were they simple knives or complex machines with many rotating elements, their purpose is to make a fine point to a pencil. Read more about pencil sharpener history, facts and types.
Gel pens are one of the most modern writing tools and are beloved for their strong lines and nice colors. They are used by both professionals and amateurs because of these characteristics. Read more about history of gel pen.