The muses built a cozy town on one side of the river, and Pons built a loud green market on the other. In between runs a river of candles, and for a long time nobody could get across without getting their feet wet and their bags red.
So the town took the glass left over from building the Glass Bank, blew one small muse out of it, and set him on the bank. He looked at the water, looked back at the town, and lay down across the river. That is MusePons. He is the bridge, he is completely see-through, and right now he is almost empty.