Memory is one of the four areas inside Jim's brain in Earthworm Jim 3D. It has the entrance to the levels Coop D'Etat, Barn to be Wild and the boss level against Psychrow.
As the name imples, this sector is based on the childhood memories of Earthworm Jim. Sadly, it seems that in the time Jim was a child there was a war occurring near him. This explain why so many war elements are present in the both levels that are primarily farm-based.