Concrete and abstract things are like the mind and the body. One can be seen and the other unseen. One is observable and the other unobserved. One is physical and the other metaphysical.
When we think about love, hate, happiness, education, sadness, or feelings, for example, these are abstract things. Their meanings have different connotations for each person. We cannot measure them. It is all in our heads about what they are. It is like asking someone about his or her feeling about something.
Contrary to what is abstract, concrete things are what you can see and what you can touch. You can observe these things with your five senses. A red flower will be red to everyone observing it. If it has a fragrance, that will be true also. We can say that a certain species of plant will bear red flowers, have a special shape, or size. This…
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