Process 1）design shape in Rhino: As we are group, we decided to design
one each. then we choose triangular continuouse etch pattern. 2 slightly different engraving form, one is
router to make spiral, another one is offset into smaller size.
Process 2）CNC Rhino Cam stimulation: At CNC simulation, we scale down size to fit 2 tiles into one form.
Radial Machining to add smooth thin lines to surface, it looks like a detail of shell and we decided to keep
in settle and simple with this organic effect.