Thoreau mostly uses imagery to illustrate time in the excerpt. The second sentence is saying that he is in the midst of time/living, and he can "detect how shallow it is," meaning that he is aware that life is short and that the end is inevitable. Thoreau also describes time as being fleeting, but ever-present.
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Answer:
They generate new thinking and/or a more in-depth understanding of a desired outcome, e.g. a solution to a problem, a definition of a shared process.
Explanation:
A collaborative conversation is a purposeful, outcome-driven conversation aimed at building on each other's ideas