Who invented the seesaw?

It is believed that Korean girls in the 17th century who were not allowed beyond the confines of their courtyard walls invented the seesaw to catapult themselves in the air high enough to glimpse the outside world, according to Patricia Newman.

It is still a mystery when the first seesaw appeared in history, according to Chicago Theater Beat. There are no explicit references to the playground contraption before the 17th century. Another theory on the origin of the seesaw that appears in The Oxford Book of Nursery Rhymes involves children borrowing a plank and a log from the local sawyers to rock up and down on for play, according to Chicago Theater Beat.