The book covers, posters and picture books Bruna made at the same time have had an inspiring effect on one another. Dick Bruna makes pictograms, he does not make illustrations. A poster, he says, should be readable at a glance. It should work by hitting you in the face. But a poster must also be humane and, if at all possible, friendly. Dick Bruna is always in search of straightforwardness and simplicity. The message must be immediately recognisable in the image. The text must be short and striking and must complement the image.