What makes something “concrete”? If you can examine something with your senses, it’s concrete. A V8 engine is concrete. “High-performance” is abstract. Most of the time, concreteness boils down to specific people doing specific things. In the “Unexpected” chapter, we talked about Nordstrom’s world-class customer service. “World-class customer service” is abstract. A Nordie ironing a customer’s shirt is concrete.
