Inclusion is like
pregnancy: you either are or are not. There's no such thing as "partial inclusion."
They both suggest a putting together of different elements, whether it be people rocks, biological stuff or psychological elements. Integration implies a thorough mixing while inclusion implies that after mixing there is still some discrete fragmented element from the original disparate parts. The pictures of kersanite in the link are a nice visual initiation.
METAMIA is a free database of analogy and metaphor. Anyone can contribute or search. The subject matter can be anything. Science is popular, but poetry is encouraged. The goal is to integrate our fluid muses with the stark literalism of a relational database. Metamia is like a girdle for your muses, a cognitive girdle.