My office time elapse

8:00AM-11:30AM Time Elapse

Here is a shot of the ceiling above my desk at my office.

The most noticeable thing to my eye is the balance between the exterior light and the interior light.  It was bright outside but when a cloud would pass you can see the light from the right side of the pipes appear to creep over.  When the cloud was out of the way of the sun it looks like the left side overtakes the right.  So it is the contrast of luminosity that is dictating which light takes the scene.

The outdoor light is rather cool compared to the warmer yellow of the interior light.  Also, since this is an east facing window, after about 10am or so the brightness from the left starts to vanish as the sun is higher in the sky than the window, so ambient light is received rather than direct.