You can see the similarities between days 1 and 4, 2 and 5, and 3 and 6 by examining the colored text above. In His wisdom, our Creator first created the habitation for the living creatures to live within, including their needs for life such as light, food, etc.. Then, after all is prepared, the habitation is filled abundantly with life to enjoy that habitation.
In addition, we see a similarity between days 1-4 in that there is a separation occurring. Interesting to note, light and darkness are separated but later again so is day and night. We can see how Yahweh separates light from darkness and be reminded of verses such as Ecclesiastes 2:13 and 2 Corinthians 6:14-18.
