Here's why:
* Metaphysics is a branch of philosophy that explores fundamental questions about the nature of reality, existence, and knowledge. It deals with concepts that go beyond the physical world, such as abstract ideas, consciousness, and the soul.
* Ideas without substance fall under the realm of metaphysics because they are not tangible or measurable in the physical world. They are concepts or constructs that exist in the realm of thought and imagination.
Other terms that are not as accurate:
* Abstract: While abstract concepts are not concrete, they can still be grounded in reality and have practical applications.
* Idealistic: Idealism focuses on the importance of ideas and values, but doesn't necessarily exclude the existence of a physical world.
* Spiritual: Spirituality deals with the realm of the spirit or soul, but can often be intertwined with physical experiences and practices.
Let me know if you'd like me to elaborate on any of these terms further!