The classical world is associated with macroscopic objects (cats, humans, buildings, oceans e.t.c.) while the quantum world is more associated with the microscopic molecules, ions, free atoms, free radicals,  electrons,  and sub-atomic particles; including quarks, neutrinos e.t.c.). Now, reality is traditionally associated with the things which are physical and visible. But from my YouTube video on the theological, scientific and philosophical view of the universe (https://www.professorcharlesflmbakaya.com), I showed that by interacting with electromagnetic radiation across the electromagnetic spectrum, nature is actively converting from matter to non-matter and back at phenomenal speeds and accelerations;  complicating observations, measurements and reality.