Cans and shells are both abandoned when no longer useful.
One, when empty (by man). One, when full (by glob-footed organisms).
Glob-footed organisms cannot live inside aluminum cans.
Shells do not litter the streets of major cities.
Broken shells can mulch flower beds.
Crushed cans cannot be flower vases.
Neither makes a tasteful ashtray.
Neither illustrates prayers or sells in tourist shops.
Neither is likely to be gilded, to impress ladies at a luncheon party, or to evoke true love.
Either might evoke memories of an ex.
Neither can nor shell should be clutched too tightly to the bosom.
Neither is an apt metaphor for the muse. Neither inspires odes. O cracked bit of shell O crushed aluminum can
And so forth.
The shell, broken, reveals a lustrous encapsulation of roseate dawn. It is pleasing to the thumb.
The can, crushed, is illegible. Its crinkled lip flashes in the sun like a razor.
More sea trash (read bones, candy wrappers, a winnowing basket here).