I don’t think that’s what this is. How would they graph something on this? It’s not like you could just draw on it. Is the blind person supposed to punch holes in it or something?
When I was a kid, the local public library had braille Playboys, which was always a joke, but considering they had amazing fiction and interviews, maybe it shouldn’t have been.
Graphing is still necessary for the blind, but it’s more common to use a plastic sheet on a hard rubber clipboard with a stylus that causes the plastic to rise up when it’s pressed with a bit of force. (Though while googling for it I found plenty of examples like yours so maybe less common than I thought)
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