Why some classes starts with Cake, others not?

Hello,
question of curiosity - why some class names in CakePHP starts with
Cake* prefix, but majority not?

Is the only reason the collision of names with generally used classes
in PHP (eg. Session => CakeSession or Log => CakeLog)? If yes, why
there is more like CakeRoute or now in developed CakePHP 2.0 - eg.
CakeRequest or CakeResponse which would not have a name collision?

Regards.

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