A hylomorphism is the composition of an anamorphism followed by a catamorphism. The dual concept is that of anamorphism that generalize "unfolds". The categorical dual (aka opposite) of the anamorphism is the catamorphism. An oblique anamorphism is the visualization of a mathematical operation called an affine transformation. You can think of the anamorphism as unfolding the initial value into a sequence. The anamorphism is the function that generates the list of A, B, C, etc.