Constraints, on the other hand, are the inverse of affordances. They limit the way an object can be used. Constraints can be used to avoid usage errors or minimize the information to be remembered. Thus constraints can also augment affordances. For example, the link at the bottom of the image above is intentionally inactivated to promote the continued reading of this chapter. Constrains can be physical, semantic, logical or cultural. For instance, consider a small hole versus a large hole. We might be able to use only one finger in the small hole, while we might be able to use multiple fingers in a large hole… Constrains further use our common knowledge about the world and particularly the meaning of the current situation but they might: