  First is Nishida’s way of taking the more inclusive as the more concrete, and the more restricted as the more abstract. This makes sense insofar as abstraction involves removal of parts, but Nishida also uses this method to reverse the usual order of things in explanatory schemas or hierarchies. As mentioned earlier, the historical world lived by human beings, for example, is more concrete than the material world studied by physics since the historical, human world comprehends (in both senses of the word) the merely physical and can never be reduced to it. Between these two worlds is the biological realm of life forms, less concrete than the human world but more concrete than the physical world.