This reminds me very much of grinding limestone slabs in the printmaking studio: http://instagram.com/p/fGcGwdwAT1/ http://instagram.com/p/fGcGwdwAT1/ (Printm

This reminds me very much of grinding limestone slabs in the printmaking studio: http://instagram.com/p/fGcGwdwAT1/ http://instagram.com/p/fGcGwdwAT1/ (Printmaking studios make good hackerspaces, and lithography has fun Chemistry involved. Etching has a little too.)