According to Kant, what exists in the noumenal world?

In Kant's philosophy, particularly in his work "Critique of Pure Reason," he distinguishes between the noumenal world and the phenomenal world. The noumenal world refers to things as they are in themselves, independent of human perception, while the phenomenal world refers to things as they appear to us through our senses.

Choosing the option about 3D forms of objects and surfaces aligns with Kant’s notion that while we can perceive and interpret objects and their forms, the noumenal reality consists of the underlying essence of these objects, which is not fully accessible to our senses. Kant argues that we can only know the phenomenal world, which is filtered through our sensory experiences and cognitive structures.

Thus, the noumenal world is indeed tied to the existing 3D forms of objects and surfaces, referring to the reality of things that do not rely on our perception, rather than how we interpret or observe them visually. This perspective is fundamental to understanding Kant’s epistemology, where the distinction between what is real and our knowledge of it becomes crucial.