The Infinite Regress

An example that I think comes from Ed Phaser is to imagine the sort of tip of a paintbrush, and it's painting them on a Mona Lisa. And whenever you ask, well, why is the paintbrush moving in this particular way to make this particular movement? You say, well, because the bit further up is moving and causing it to move. And that explanation just goes on back and back andback and back along this infinite paintbrush. If somebody were to say, you're making an argument against free will or?