The Interpretation of Dreams by Sigmund Freud Chapter 5 Page 16

All elongated objects, sticks, tree-trunks, and umbrellas (on account of the stretching-up which might be compared to an erection! all elongated and sharp weapons, knives, daggers, and pikes, are intended to represent the male member. A frequent, not very intelligible, symbol for the same is a nail-file (on account of the rubbing and scraping?). Little cases, boxes, caskets, closets, and stoves correspond to the female part. The symbolism of lock and key has been very gracefully employed by Uhland in his song about the “Grafen Eberstein,” to make a common smutty joke. The dream of walking through a row of rooms is a brothel or harem dream. Staircases, ladders, and flights of stairs, or climbing on these, either upwards or downwards, are symbolic representations of the sexual act.

Smooth walls over