The discussion of jāmiʿ distinguishes rational (عقلي), estimative (وهمي), and imaginal (خيالي) bonds. They differ according to the faculty or mode by which two objects are related.
TypeTypical relation
RationalIdentity, similarity or an intelligible correlation
EstimativeAn association through perceived likeness or opposition
ImaginalImages become associated in imagination or recollection
These are not merely labels for memorization. A reader may know that two persons are distinct while still picturing them together as a single rhetorical scene. The kind of bond explains why coordination is effective.