Lakkhana

To avoid being too attached to the 3 poisons, one of the problems is the usage of Five Aggregates to infer values of matter. Then, we think of rupa which becomes the mover of our thought. When we study lakhana, we were told it is different from rupa. Based on the connotation of lakkhana, can you help explain the dharmic manifestation of mind? If you have any related document to share, I will be grateful.
Thanks