A basic question

On 4/20/06, Combs, Mike wrote:
(...)
> And on further reflection, one might have mirrors permanently oriented
> to reflect light to the windows, and have mirrored shutters on the
> inside of the habitat which might be turned manually twice each 24 hrs.
(...)

Depending on the side of the shutter mirrors, they could also be
turned using horses, oxen or other type of animal traction.

Alternatively, the habitat could have no shutters at all and receive
sunlight in a 24/7 way.