Simplicity of Iris Folding
Simplicity of Iris Folding
Simplicity of Iris Folding
Simplicity of Iris Folding
Triangle

Color 1:  1, 4, 7, 10, 13, 16
Color 2:  2, 5, 8, 11, 14, 17
Color 3:  3, 6, 9, 12, 15, 18