When Gan-chan expresses a wish to "fly like the birds", Skuld and Urd build for him a series of increasingly complex flying machines, paralleling the history of flight. The devices begin with Urd's attempt to build Icarus' wings, followed by Skuld's construction of the Montgolfier brothers' balloon, Otto Lilienthal's glider, Samuel Langley's (unsuccessful) Aerodrome and, ultimately, the Bell X-1, as Belldandy narrates. However, Gan-chan is still unsatisfied and wishes to travel to space.