Four Lissajous figure coaster variations, also known as Bowditch Curves. Protect your surfaces with these beautifully detailed coasters. This was precisely etched with an xTool-F1 laser, creating sharp, clean lines. I used this jig: https://than.gs/m/972004?affiliateCode=PILED 100x100x5.5mm Eucalyptus red-faced plywood