المراد بالحسي المدرك هو أو مادته بإحدى الحواس الخمس الظاهرة
The sensory is what is perceived itself, or whose material is perceived, by one of the five external senses.
This qualification does not require an imagined compound to exist externally exactly as described. Its constituent materials may be sensory while their arrangement belongs to imagination.
A ruby, a spear, a banner, and the wind may each be sensible, yet an elaborate scene constructed from them need not have occurred in the world. The difference between sensed constituents and an invented combination is central to the next distinction.