Extraphysical Monism is an extraphysicalist philosophy that both, physical and extraphysical are the same thing and the same substance, but on different levels of existence, where physics does not disprove extraphysics nor extraphysics disprove physics, where all physical and extraphysical are the same and that all physics and extraphysics are interconnected and there's no difference in the substance of physics and extraphysics, just different levels, states and forms of matter and physics. Extraphysical Monism is usually advocated by Atheist Extraphysicalism, since on atheist extraphysicalism both, physics and extraphysics are the same thing such as all physical and extraphysical life forms are the same and even that natural sciences and extranatural sciences are the same thing on different states and levels, and extraphysical monism is usually advocated by classical extraphysicalism itself since it usually considers everything as extraphysical.