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![If you put chalk under a powerful microscope—white cliffs of Dover type chalk, not the modern blackboard variety—you will see something like this Because it's not just a rock. It's an accumulation If you put chalk under a powerful microscope—white cliffs of Dover type chalk, not the modern blackboard variety—you will see something like this Because it's not just a rock. It's an accumulation](https://preview.redd.it/hqcplrau7jc11.jpg?auto=webp&s=c8869075e246385d04c0e32ac122b12997ac4bc2)
If you put chalk under a powerful microscope—white cliffs of Dover type chalk, not the modern blackboard variety—you will see something like this Because it's not just a rock. It's an accumulation
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![Mathematicians' chalk experiments captured as art in new book from photographer Jessica Wynne | University of Chicago News Mathematicians' chalk experiments captured as art in new book from photographer Jessica Wynne | University of Chicago News](https://news.uchicago.edu/sites/default/files/styles/full_width/public/images/2021-12/benson-farb.jpg?itok=LexPWHib)