Lego v Chalk

I've just spotted a video of a printer made of lego, printing out a picture of a pony. It has LEGO PEOPLE working on the top of it.

Can I make this work with chalk?

Watch the video and discuss...

NB - If anyone thinks this is possible, you have my whole bag of crayon-shaped chalks (sorry John and Becky) and the promise of eternal love, devotion and blackboards, to make it work for me.

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