Easiness to create the design
(Conclusion) The registered design is not easy to create based on Prior designs. (Design right owner won.)
Among the triangular wave zigzag line patterns, there are various line thicknesses and lengths and forming angles of respective linear portions, and there is room for selection, and the width of the groove interval to be selected is decided in consideration of the impression received from the design, and therefore, considerable creativity is required.
The applied design impresses delicate, sharp, unstable, etc. on the viewer as a whole.
<Writer: Hideki Takaishi (Attorney-at-law licensed in Japan and California)>
https://www.ip.courts.go.jp/app/files/hanrei_en/104/000104.pdf