Present day CNC/Lasercutters have a indirect interface involving external computers.
Chal-Kaat is a direct manipulation laser-cutter that's aware of the strokes being drawn on the workpiece.

Video: https://www.youtube.com/watch?v=v63_z2-_jfs

Chalkaat is a pen stroke based UI for interacting with laser cutters, where the users can express themselves more directly by working directly ' on the workpiece'. The camera on top tracks the strokes on paper.

Different colored markers allow different commands to be executed. We built a laser cutter from ground up, with computer vision and mechanics to optimize for the interface.