The furnishings were mediaeval; the floors were of red brick… I discovered layers of brick among the ordinary stone blocks… As soon as I saw this I knew that the walls dated from Roman times.
Brick strata in Jung’s house-dream function as depth-markers, signalling the descent from medieval personal history into the deeper Roman stratum of the collective unconscious.
, The Handbook of Jungian Psychology: Theory, Practice and Applications, 2006thesis