Even more confounding was the construction of the thing. A neat row of rivets ran down the center, and there was a standing seam between them. It had clearly been made in two halves and riveted together. This was far beyond what a pony could do. The largest forges Lyra was aware of couldn’t fit more than a steel hoop for a tire. She couldn’t even imagine the process for working such a giant piece of metal. Maybe a dragon could do it, but the amount of time required to make such a perfectly smooth surface—even if a unicorn skilled in metalwork helped—was unbelievable, and the cost of production was unfathomable. 