Wimmelbooks are a type of wordless picture books which display a series of panoramas teeming with an immense amount of characters and details. They constitute a narrative threshold genre with the potential to accompany children a good piece of way along their path to literacy and introduce them to different strategies of coping with the world and of telling stories. In contrast to puzzle or search books, wimmelbooks rely on their readers to find their own way through the rich material they present and do not direct readers' attention by phrasing explicit search tasks. Visual references to other works of fiction may provide an additional stimulus and motivation for adult readers and thus constitute the "dual address" of such books. They allow for manifold reading options and encourage a highly active response from children and adults alike, which rightfully might be described as a form of playing.

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Reading as Playing: The Cognitive Challenge of the Wimmelbook by Cornelia Rémi | Papers by Cornelia
In: Bettina Kümmerling-Meibauer (ed.): Emergent Literacy: Children's Books from 0 to 3. Amsterdam: Benjamins, 2011 (Studies in Written Language and Literacy 13), 115-139.

What means Wimmelbuch (Wimmelbook)?