Complex Generalization uses bonds but they change for each member of the category.
Complexes: A little more defendable are categories formed through complexes. Here, a category is developed on the bases of a real bond. The problem is, that the bonds keep changing for each pair of objects. There are two kinds of Complexes: Chain and Associative.
Chain Complexes: The classic model for a Chain Complex is Dominos--the game, not Pizzas. There are blocks with two number on them (eg.,1 & 3). You may match another block to that because it has a the same number (1 & 4). To the second block you match a third because it has a 4 and 2; then a 2 and a 3; and a 3 and 1.