Map Receptacle Question

I've searched this time and time again and only came up with extremely old speculation/theory threads.

Has anyone said why there are four slots to place maps in the Map Receptacle? If so, why? I've tried four of the same map with the same level, same maps with increasing level, different maps, all rare maps, all magical maps, etc.

Chris has said in interviews it is purely for trolling purposes right now.

I remember hearing it from somewhere that maps used to be 2x2 but they took too much room, so they shrunk it and may add items to mod maps even further in the future.


EDIT: Don't take my word for it :o

In the very first preview of the map system, Chris used the phrase "map words." That is all that has really been said about it; the devs are keeping their plans secret.