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So we have a LeapStart book for the preschooler. I haven’t managed to work out how it works. It has a stylus that you touch things on the pages of books that you set into the leapstart. I can’t work out how it knows what page it’s on, they are too flimsy for any electronics in the pages. Any ideas? As far as I can see on the stylus it has a pressure sensor and some sort of visual sensor up by the pressure sensor.
Edit: mystery solved!! See replies!
Kiddo stopped playing so I took a better picture of the stylus.
@CatherineFlick @floriann @tante ah that's the new design. We had the first gen one which has x/y position sensing of the 'pen' in the bookcase and you had to tell it which page you were looking at before it worked.. very much simpler, just a magnetic stylus tip.
I replaced the pen at least twice! 
The dot pattern encoding idea is very smart, almost stenography.