Editing Arrow of time (section)

== Conception by Eddington ==
In the 1928 book ''The Nature of the Physical World'', which helped to popularize the concept, Eddington stated:

<blockquote>Let us draw an arrow arbitrarily. If as we follow the arrow we find more and more of the random element in the state of the world, then the arrow is pointing towards the future; if the random element decreases the arrow points towards the past. That is the only distinction known to [[physics]]. This follows at once if our fundamental contention is admitted that the introduction of [[randomness]] is the only thing which cannot be undone. I shall use the phrase 'time's arrow' to express this one-way property of time which has no analogue in space.</blockquote>

Eddington then gives three points to note about this arrow:

# It is vividly recognized by [[consciousness]].
# It is equally insisted on by our [[reason|reasoning faculty]], which tells us that a reversal of the arrow would render the external world nonsensical.
# It makes no appearance in [[physical science]] except in the study of organization of a number of individuals. (In other words, it is only observed in entropy, a [[statistical mechanics]] phenomenon [[emergent property |arising from a system]].)