Link sculpting is all about directing the power of your pages within your site. When you obtain a link from another site, you do so in the hope that some of that page’s ranking will rub off on you. When you link between your pages, you’re essentially doing the same thing. The idea is that by using no follow on a link, that PageRank attributed to that link is instead redistributed to other links on that page.it is controlling the flow of PageRank around a website. PageRank is Google's measure of the value of incoming links to a web page.Basically PageRank sculpting is a good idea if you are trying to tweak your site to get that little bit of extra traffic.
SO Link Sculpting is a very famous Technique used is
SEO by the different SEO experts