Much of intellectual depth is play in all its forms, and we're so childish we think play should have it's own discussion area.
The rest of intellectual depth seems to be "meaning" (which is only sometimes part of play). The search for purpose and truth in our lives might be our greatest need, the highest expression of our need to understand our environment.
Auxiliary Elements for document tb.depth.depthsplit.mind.htm
Part of Toolboxes and Treasure-chests.