It looks like there are 2 squares of 15x15. Square #1 is 15x15 of the 1" scrappy squares, with a purple square at the center of each side. Square #2 a 15x15 combination of white 1" squares ( the center) and scrappy 1" squares around the white. The green 1" are the center of all sides. When you put one of each together, then the purple centers of square #1 would match the green center squares of block #2. If I knew how to do the drawing thingy on the quilt picture it would be better.