Celtic Challenge 14 I have decided to challenge you to a Celtic Stack this week. A stack is a group of shapes stacked on top of each other. A Celtic stack is a group of shapes woven together. You can choose to copy my stack outline, or make one of your own. I decided to turn my stack sideways to make a little scene. You will probably see the glaring mistake I made while weaving my stack, but I left it there anyway. The doodle patterns I have used are: The Green Frame - "Multi" on the inside…