The swirling snow fell on the soldier's shield,
covering the symbol of Hrothen's Hope.
The swirling snow fell on the dwarf's black beard,
and melted into the darkness.
-opening poem of Hrothen's Curse, a dwarven tale
The Chinese, when attacking a castle or fort, flew kites over the city wall and used the length of string it took to get it there as a measurement to know how far they had to dig a tunnel to get under the wall.