# 2.15121 explained — Tractatus Logico-Philosophicus

> Chapter companion for Tractatus Logico-Philosophicus by Ludwig Wittgenstein.

## What happens

This brief proposition uses an analogy of measurement to illustrate how logical form relates to reality, suggesting that only the extreme points of a representation make contact with the object being represented.

## Key lines

> Only the outermost points of the dividing lines touch the object to be measured.

In a measurement, only the endpoints of the scale actually come into contact with the object, not the entire scale.

_This metaphor likely extends Wittgenstein's picture theory, indicating that only the logical structure's boundaries connect with reality._

## Links

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