Wasnt there a movie, where kids were sent to a camp to dig holes all day long, then start again the next day? Scott may not be working for an underground construction company anymore, however, he still likes to dig.
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Since the grass is still not doing well, he might as well start digging the pond in the back part of the yard.
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He is planning a little island in the middle of the pond.
From the back corner of the yard will be a little stream/waterfall that will feed into the pond. He digs, then he reads. He reads, then he digs. He has admitted this is his therapy.