13-1 Color dots

13-10 Color dots

13-11 Color dots

13-12 Color dots

13-13 Color dots

13-14 Color dots

13-15 Color dots

13-16 Color dots

13-17 Color dots

13-18 Color dots

13-19 geometry

13-2 Color dots

13-20 geometry

13-21 geometry

13-22 geometry

13-23 geometry

13-24 geometry

13-25 geometry

13-26 geometry

13-27 geometry

13-28 geometry

13-29 geometry

13-3 Color dots

13-30 geometry

13-31 geometry

13-32 geometry

13-33 geometry

13-34 geometry

13-4 Color dots

13-5 Color dots

13-6 Color dots

13-66 Abstract geometry

13-67 Abstract geometry

13-68 Abstract geometry

13-69 Abstract geometry

13-7 Color dots

13-70 Abstract geometry

13-71 Abstract geometry

13-72 Abstract geometry

13-73 Abstract geometry