A dream, Carl Jung had in 1909, provides a case in point.

“I was in a house I did not know, which had two storeys. It was “my house”.
I found myself in the upper storey, where there was a kind of salon furnished with fine old pieces in Rococo style.
On the walls hung a number of precious old paintings. I wondered that this should be my house and thought “not bad”.
But then it occurred to me that I did not know what the lower floor looked like.
Descending the stairs, I reached the ground floor. There everything was much older.
I realised that this part of the house must date from about the fifteenth or sixteenth century.
The furnishings were mediaeval, the floors were of red brick. Everywhere it was rather dark.
I went from one room to another thinking “now I really must explore the whole house.”
I came upon a heavy door and opened it. Beyond it, I discovered a stone stairway that led down into a cellar.
Descending again, I found myself in a beautifully vaulted room which looked exceedingly ancient.
Examining the walls, I discovered layers of brick among the ordinary stone blocks and chips of brick in the mortar.
As soon as I saw this, I knew that the walls dated from Roman times. My interest by now was intense.
I looked more closely at the floor. It was of stone slabs and in one of these, I discovered a ring.
When I pulled it, the stone slab lifted and again I saw a stairway of narrow stone steps leading down to the depths.
These, too, I descended and entered a low cave cut into the rock. Thick dust lay on the floor
and in the dust were scattered bones and broken pottery, like remains of a primitive culture.
I discovered two human skulls, obviously very old, and half disintegrated. Then I awoke.”

Jung interpreted the dream as affirming his emerging model of the psyche.
The upper floor represents the conscious personality, the ground floor is the personal unconscious,
and the deeper level is the collective unconscious – the rudimental, shared aspect of psychic life.
It contains what he came to call the archetypes, a fundamental feature of Jung’s psychology.

Hier some alternative interpretations of Jung’s House dream

… and about Consciousness, Wolf’s Iceberg: