For thousands of years people have wondered what reality is. Eastern philosophers concluded that the physical world is an illusion but the west split between physical realism, that physical matter is real, and idealism, that what we see reflects something else. Logically, one of these world views must be wrong and orthodox science and religion took opposite sides on the issue.
QR1.2.1. Idealism vs. Physicalism
QR1.2.4. The Reality Options
QR1.2.5. Quantum Realism
QR1.2.6. The End of Science?