Summary: collapsing refers to matching, including strong or complementary. Stronger patchwork refers to two more remote colours, such as yellow and ultraviolet, red and green, which are strongly compared; and to the complementarity of two relative colours, such as red and green, blue and orange, black and white. Combination refers to matchmaking, including strong or complementary. Stronger patchwork refers to two more remote colours, such as yellow and ultraviolet, red and green, which are st...