Still, an underlying question remains. Why must we specifically learn the laws of Shabbos at the time when God is describing the building of the Mishkan. The Midrash addresses the very nature of mishkan. Apparently, this response indicates a manly need for God's presence. Considering the act of Creation, God created Heaven and Earth from nothing, a very different type of work than ours, which is, in effect, to make a change in an already existing material.
Creation is, really, a holding back of the infinity that existed prior to creation.
This concept of tzimtzum gives us new insight into the Shabbos itself. Now we can highlight the connection of melacha to mishkan. Human creativity is mere improvement of an existing creation, in contrast to God's creation. The end point of the tzimtzum that God displayed in creation is the Shabbos, a return to the infinite. Our creative work is moving, instead, in the forward direction, taking what is and improving it.