Almost overnight, this Scottish field is turned into a
medieval construction site. Timber framers, stonemasons,
carpenters and blacksmiths turn back time and employ medieval
building techniques to construct two giant trebuchets. One
design features a fixed counterweight and wheels; the other is
wheel-less and is loaded with a swinging counterweight.
Observes Marcus Brandt, an on-site carpenter: "If it weren't
for the jets flying overhead, you'd think you were in the 12th
century."