The butterfly effect is the phenomenon whereby a minor change in circumstances can cause a large change in outcome. PDF BUTTERFLY The pattern pieces as given make a 7 3/4" x 7 3/4"(20 x 20cm) block; for other sizes, use the handy percentages chart to enlarge or reduce the pattern to your desired block size. Templates are actual size with 1/4" seam allowance. This PDF file contains 4 pages. Before you print, make sure that the page scaling is None or Actual size. Note:This pattern does not contain basic instructions. SIZING / FINISHED MEASUREMENTS 7 3/4" x 7 3/4"