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How to be productive while entertaining yourself
Decorate your books.
Doodle on everything and let your imagination run wild; just be sure that these are your own books and not books that you have borrowed or have just found.
Try using pictures to help you memorise things.
If you have something you need to remember for school or work, create a picture-system so that whenever you need to remember, you will think of that picture! Experiment with different styles of art. Try drawing something you wouldn't usually think of.