on numbers

Human mind requires some additional abstraction or understanding to go beyond the first few or several small numbers. Class-0 numbers are those that are small enough to have an immediate intuitive or perceptual impact. Class-1 numbers are those that are small enough to be perceived as a bunch of objects seen directly by the human eye. Class-2 numbers are those that can be represented in exact form using decimal place-value notation.

via iliat

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