Objects exist independently of our perception.

We can only directly perceive our own mental representations of objects.

The physical world is fundamentally unknowable.

Reality is composed of both physical and mental substances.

Plato

Aristotle

Immanuel Kant

John Locke

The physical world that exists independently of our perception.

The mental representations of objects that we directly perceive.

The boundary between the physical and mental realms.

The unknowable essence of reality.

It denies the existence of an external world.

It argues that we can have certain knowledge of the external world.

It posits that the external world is fundamentally unknowable.

It claims that we can only know our own mental states.

Indirect realism is a form of phenomenalism.

Phenomenalism is a form of indirect realism.

Indirect realism and phenomenalism are distinct theories.

Indirect realism and phenomenalism are incompatible theories.

It posits that the object itself is constantly changing.

It argues that different people have different mental representations of the object.

It claims that the external world is fundamentally unknowable.

It denies the existence of an external world.

It is too skeptical.

It is too dogmatic.

It is too complex.

It is too simplistic.

The transcendental unity of apperception is a necessary condition for indirect realism.

The transcendental unity of apperception is a sufficient condition for indirect realism.

The transcendental unity of apperception is both a necessary and sufficient condition for indirect realism.

The transcendental unity of apperception is unrelated to indirect realism.

It is the object as it exists independently of our perception.

It is the mental representation of an object.

It is the boundary between the physical and mental realms.

It is the unknowable essence of reality.

It denies the existence of illusions.

It argues that illusions are caused by our mental representations.

It claims that illusions are caused by the external world.

It posits that illusions are caused by a combination of mental and external factors.

Noumena are the objects as they exist independently of our perception.

Noumena are the mental representations of objects.

Noumena are the boundary between the physical and mental realms.

Noumena are the unknowable essence of reality.

It argues that technology distorts our perception of the world.

It claims that technology enhances our perception of the world.

It posits that technology does not affect our perception of the world.

It maintains that technology is irrelevant to our perception of the world.

It is the unity of consciousness that allows us to synthesize our various mental representations into a coherent experience.

It is the boundary between the physical and mental realms.

It is the unknowable essence of reality.

It is the object as it exists independently of our perception.

Epistemic access is the ability to directly perceive objects in the external world.

Epistemic access is the ability to directly perceive our own mental representations of objects.

Epistemic access is the ability to know the external world through our mental representations.

Epistemic access is the ability to know the unknowable essence of reality.