1 Topsoil is also sold in bags, at $2-$5 a bag. 2  It takes roughly 18-20 bags to make a cubic yard, or $36-$100. 3  That works out to about $180-$500 for five yards; typically, bags of topsoil are only used for extremely small areas.
The system metaphor is one of the trickier parts of XP (Extreme Programming). This presentation is from a tutorial taught at several of the early agile conferences, and includes material supporting the exercises. CC-BY-SA. Published in: Technology, Entertainment & Humor.
The iceberg metaphor is a commonly used visual when attempting to relate the ego, id and superego with the conscious and unconscious mind. In the iceberg metaphor the entire id and part of both the superego and the ego would be submerged in the underwater portion representing the unconscious mind.