| Library cataloging and classification | |
|---|---|
| main topic | metaphysics |
| Colon | R3 |
| Dewey Decimal | 11 |
| Library of Congress | BD95-131 |
| Universal Decimal | 11 |
Metaphysics is the branch of philosophy that is about the nature of reality. It looks at the differences between mind and matter, between substance and attribute, and between possibility and actuality.