Hi Teen, I looked at the link you posted and if you take a close look at the one quilt that looks intertwined, there is an optical illusion going on. Each side of the strip is a different color, Still done in strips and edges are cut to join them together. That is if I am looking at the right quilt. I looked through many and didn't see any ade with Y seams but I could be wrong. Which particular quilt were you looking at 'cause I am curious?