Limestone is a common type of carbonate sedimentary rock.
It is composed mostly of the minerals calcite and aragonite, which are different crystal forms of calcium carbonate.
The comparison of the word “we” to limestone helps to develop the theme that a collective society destroys humankind's potential.
In the excerpt, the author describes how the concept of "we," when poured over men, hardens everything that the men were before, and their qualities lose their uniqueness and their contrast.
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