The concept discussed in Henning Mankell's "quicksand" revolves around the paradox of attraction to repulsion. It highlights how elements that are considered disgusting can sometimes draw us in, presenting a complex interplay of aversion and allure. This notion suggests that our instincts push us to explore the very things that we initially perceive as negative or off-putting.

Mankell further elaborates on this dynamic by illustrating the way our curiosity can overpower our better judgment. Just as we may feel compelled to investigate something unpleasant, it reflects a deeper aspect of human nature: the allure of the forbidden. This duality presents a challenge as it reflects our desire for understanding and experience, even when it comes from engaging with troubling or distasteful subjects.