Answer:
Fog catchers, fine mesh nets erected on foggy hillsides, capture tiny droplets of water from fog that later, when enough droplets have been caught, drip down into gutters. This fresh water can be stored in tanks.
Here is an example of one, I think ---
Wow, those flowers are dancing ballerinas swaying around!
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Glad I could help, and good luck!
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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.
I hope this helps!
What are the elements of drama?