I just ripped out laminate I had previously installed in a half bath in my house to install some wood plank porcelain tiles that my wife picked out at our local box store. Instead of making it easy and laying it straight I thought it would be cool to do a herringbone pattern. I have never installed anything in this pattern let alone tile but hey, if it looks like crap its in my house so who cares? lol. I had done some research to figure out how to strike my lines and without explaining exactly how I did it, got them down. However I must have screwed something up because as I got further down the line each plank got a little further off the line. I took about five or six of the planks and moved them all together back onto the line to adjust the pattern but Im curious as to what I messed up. I dont do much tile anymore, I stick to hardwood and laminate but I though it would be cool to try in my house. Ive never tried a herringbone either, I dont get much call for the fancy stuff, lol. thanks guys.