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Interesting are those cases which imply token identity, but not reducibility. E.g. I try to fall asleep and count sheep, but the 3rd, 9th, 10th and 11th of 12 animals are not sheep, but goats. (> elms/beeches)
But these classifications do not help if I want to formulate interesting laws or hypotheses that go beyond the observed cases. E.g. That the goats have horns. I can pick out every single sheep and goat of my imagination, but because of "conceptual poverty" I cannot generally distinguish the sheep from the goats.
... one can neither have the idea of one's own self nor anything else before one has the idea of other subjects and a common world.
Der Mythos des Subjektiven Stuttgart 1993
Handlung und Ereignis Frankfurt 1990
Wahrheit und Interpretation Frankfurt 1990