sentence: Some folders use rulers or other flat tools to make sharper creases in the models.
sentences_before: Many paperfolders prefer to use a flat surface to fold models on, but others, like the Japanese, fold in the air. Traditional paperfolders believe that only the hands should be used when folding, but many modern folders use other tools when folding. Tweezers and paper clips can be used to make very small folds.
concept_name: folder
headings: Origami Materials Tools