[Dysprosium]

Seems like our brain think in log.

[andreyf]

That's probably because the size of decimal digits written down on a piece of paper is in log.

[Gladdyu]

Our number system is in log: value(number) ~ 10^length(number)

[egillie]

There's some evidence for that! http://www.sciencemag.org/content/320/5880/1217.abstract