I found this technique while perusing the world of ceramics on YouTube last year and really enjoy the result of this.
In the beginning, I found it difficult to create a similar texture as Hsin does in the video. I then realized I had to make the same tools as Hsin did.
Conveniently, Hsin had made a tutorial on how to make one's own trimming tools, click here to watch. Once made, I fell in love with this technique and am still developing my skills.
Artist: Hsin-Chuen Lin, website: http://www.etsy.com/shop/hsinchuen/