One possible interpretation is that the magician is in fact causing the sun to rise. He is not only the beginning, but the cause of the beginning; the first cause, not just making the sun rise, but making the sun, which is the source of all life on earth, and must therefore be considered our physical beginning as well.
If I wanted to look really hard, and I'm not sure I do, I might take even a step further and say that all four elements are here represented by the sun (fire), the sky (air), the brown fur the magician is wrapped in (earth) and the blueness of his skin (water). I think that's stretching things a bit, but what are tarot cards for if not to stretch things?