This interpretation does not reflect the blend of features presented by the El Camino. What we know intuitively, and what we want to communicate, is that the El Camino is partly a car and partly a truck. The concept of fuzzy sets originates from the observation that the world is not really composed of crisp sets, it is not really black and white, but rather is composed of shades of grey. Many variables overlap more than one group, and we want our classification to reflect this. Fuzzy set membership of an element can be to a degree anywhere from 0 to 1.
Specimens can be a member of many sets to a degree.
Most importantly, objects in an intersection between two sets can belong to both sets to a degree. Revisiting our example, we can set up our two sets as fuzzy sets. In this model, the sedan and the pickup truck still sit comfortably within their respective sets. Now, however, the El Camino is partially in both sets, and our interpretation can reflect that the El Camino is partly a car and partly a truck. So fuzzy sets can apply to fossils too.