Based on the alchemic symbol for creation,  the sun and the moon represent everything. Good, evil, light, dark,  masculine, feminine, etc. The 4 main elements (earth, fire, water, air)  are seen in everything and are all connected.

The  windows are gateways into possibility. In one you have what will and the  other what could be. Both rely on the self and what we do to shape our  future. It is all connected.