Sense Data - The Structure of the External World

The world is a construct of the understanding. But that doesn't mean you can create the world simply through your own inner mind, or simply through the understanding. It's what the understanding does. This is his meaning of the word intuitive that he takes from kant. We intuit. The outer sense is what we might think of as sensations that impact our five senses: sight, sound, taste, touch, smell. And it's the combination of sensation and representation, space and time, the subject and the object, that the understanding then brings together and basically intuits this concept of causality on it.