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Cartoons/Comics are a tried and tested way to lift heavy subject matter.
To this end, educational publishers often enjoy seeing pictures done in a light-hearted form, for instance the well-worn debate format in the classroom can be shown with a new twist (the Grobby style) while still conveying all the info it needs to.
An important aspect of visual literacy is showing kids the conventions of comics, e.g. the speech bubbles, how dotted lines can convey whispers, spiky lines are a shout, bold text is louder and so on. Some of these are shown in the collage with the little Viking girl.