How do you recall what you stored in a palace?

Mentally walk the same route in order, "arrive" at each locus, see the image waiting there, and decode it back to the original item.

Recall is just the journey run in playback: start at the first locus, notice the scene you staged, translate that image back into the fact (or number, or name) it stood for, then move to the next locus. Because the route is fixed, the items come out in the exact order you stored them. If you encoded with a system (Major System, PAO), decoding is the inverse of encoding — read the image's meaning off.