Kant's grid of concepts
Chapter 5 endnote 8, from Lisa Feldman Barrett.
Some context is:
You see people walking, moving their bodies and faces. You hear sounds and smell diverse scents. Your brain puts this information together to perceive events like children playing in a park, a person gardening, an old couple holding hands on a bench. You create your experience of these objects, actions, and events by categorizing using concepts. [...] The philosopher Immanuel Kant wrote that we perceive the world in terms of concepts.
The 18th-century philosopher Immanuel Kant is famous for distinguishing between raw sensory input, which he called the “faculty of sensibility,” and our ability to organize sensations into uniquely human experiences, which he called the “faculty of understanding.”
Kant believed that people have a “grid of concepts” over their eyes that they see through, so that the mind plays an active role in constituting the features of experience. He believed that concepts are endowed (we are born with them). Kant did not use the word “categorization” but was describing the same idea.
A somewhat similar idea was proposed by the 7th century CE Buddhist scholar Dharmakirti who wrote that the basic elements of consciousness, known as dharmas, are constructed with human concepts that reside in and originate from the human mind. So dharmas are the ways that humans understand the world and their own sensations.