The first day of creation window deals with the questions asked by science of creation i.e. how was the universe created and what existed before the creation.   In the Torah, it tells you that the universe was created through the power of speech.  God said, "Let there by light," etc.   Therefore, the Rabbis reasoned, what must have existed before the creation were the words God used and the letters which make up those words.  Hence, we represent the "Tohu v' vohu," or primordial state of the universe, as a chaos of Hebrew letters.  In fact,  it is not chaos, at all, but words coming into formation, such as "or," for light, the first thing created, "berasheet," the first word of the Torah, "Adonai," "Elohim," and many other names of the creator.  On Day One, Adonai creates energy.