GR translation: silver ringing the fields of white

[Mike Jing]

V715.36-716-3, P730.9-16   “Cyst salad,” Roger continues, “with little
cheery-red squares of abortion aspic, tossed in a subtle dandruff dressing.”
       There is a sound of well-bred gagging, and a regional sales manager
for ICI leaves hurriedly, spewing a long crescent of lumpy beige vomit that
splatters across the parquetry. Napkins are being raised to faces all down
the table. Silverware is being laid down, silver ringing the fields of
white, a puzzling indecision here again, the same as at Clive Moss-moon’s
office . . . .

What is "silver ringing the fields of white" trying to invoke here?
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