a lot of things are "organized', its how we like things as humans.
Think about Genesis right at the beggining. Imagine the guy writing the first words of the bible. Back then, it must have seemed a really impossible task to get all his thoughts and words out on to a peice of paper.
In the beggining god created...etc etc all up to the seven days. Its how we as humans like things, "in little boxes" so to speak.
Its just how we are, and how we like to see things, have everything organized. Becasue lets face it, God almoighty could do all he did in those seven days, times it by seven, destroy it all do it all over again several times, at the snap of our fingers.
If he wanted to.