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The word was 'detritus' or in other words: debris, odds and ends, decaying or disintegrating stuff, AKA: trash.
The reason I was amused was because here was a writer describing something seemingly valueless in order to ascribe some sort of literary value to himself. It's like when anyone uses the word 'esoteric'; the word is self-fulfilling. Esoteric is esoteric. It means: requiring or exhibiting knowledge that is restricted to a small group. The people who understand and use the word esoteric would most likely qualify as a somewhat small group. And, in a similarly laughable (but inaudibly laughable) way, using the word detritus to say trash to look good is amusing to say the least.
Of course I may be reading into this too much. Maybe the author uses the word detritus in his everyday speech. In fact, maybe everyone does. Maybe I'm the dumb one...or just jaded. Cue that mediocre Aerosmith song.
This was apparently on the same sidewalk as the previous picture:
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