This is a fantastic article on an item used for education that is especially relevant for children. I think this would be a fantastic item to add to a medieval/pre-modern setting.
Both medieval manuscripts and their modern counterparts are designed to accommodate human readers. Our two hands can keep an open book under control with ease by applying gentle pressure on the outer margins of the pages. Release the pressure with your right hand and a page lifts up in the air, just enough to conveniently flip it. With a rustling sound it travels from right to left, moved along by an impatient reader that is left in suspense for a second or two. The proportions of the page, too, are designed to accommodate consumption by human beings. Our eyes can handle only a small number of consecutively placed words, no more than eight or so, depending on the size of the letter. As a consequence, medieval page design shifted to presenting a text in two columns rather than one, a transition that occurred over the course of the twelfth century.
This relationship between book design and human anatomy is seen most vividly in a particularly peculiar bookish object…
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