What is "neolttwigi"

Neolttwigi is similar to seesaw, except that participants stand on each end of the Neol (board) and jump, propelling the person opposite into the air. When performed as a spectacle, acrobatic tricks such as flips or skipping rope while in the air are often included.

It is thought that Yangban women developed Neolttwigi to see over the walls that surrounded their homes, as women in traditional Korea were rarely allowed out of their living compounds, except at night.