Bunjin or literati style is a less common bonsai style. It mainly relies on the line of the tree for its focal point. The canopy and the pot should be minimal to keep the focus on the line of the tree. It is a style that has its admirers as well as many that do not like it. I have a short article at http://www.bonsaihunk.us/info/Bunjin_literati_Style.html

Ficus ‘Mexicana’ showing an interesting trunk line, minimal canopy, and restrained pot