There is a need to continue exploring how such problems should be thought about.
Problems are strange nebulous entities having a shadowy existence.
The shadowy nature of problems derives from the fact that they represent in part an objective state of affairs and in part a subjective state of mind. But even this objective quality may be questioned. Problems and solutions are, however, based on the perceptions of individuals. They are not objective conditions of the real world. Nevertheless, problems may appear in different forms to different people.