Something in the imagination/memory
When you imagine a triangle, you picture a phantasm
* If there is no phantasm, then the intellect can’t see (referencing eye damage), the intellect needs the phantasm
Example: When you encounter a triangle, you store an image (phantasm) in your mind, and every time you encounter another triangle, you store that image in your mind, (like a bag in your mind that has various shapes of triangles)