Besides hard and soft, what other ways can you think of that could be used to divide non-living things into two groups?

Besides hard and soft, conductors and isolators is another group to divide non-living things into two groups.

Explanation:

The general classification is a very hard task to do. However, if we think in absolutes we will be able to find ways to divide non-living things into two groups. Think about one thing, for example, flammable or not flammable, shinny, or opaque. We just need to find a characteristic and them see if we can group non-living things below them.