Bonsai Empire has a combination article/video titled “Working the Trunk” which is about chopping trees back to get a bigger trunk. The article portion is really great with good tips on chopping. The video is excellant and they describe the theories used to thicken up trunks for Bonsai. If your new to Bonsai this article/video will help you understand what it means to chop a Bonsai tree. I have added the article/video the Chopping Trees page under Bonsai Basics.