Seesaw

A person sits on each end, and they take turns pushing their feet against the ground to lift their side into the air.

For this reason, seesaws are often mounted above a soft surface such as foam, wood chips, or sand.

[3][4] In 2019, a set of seesaws were installed spanning the US-Mexico border fence between El Paso and Ciudad Juárez.

Another possibility is the situation of the apparent appearance, disappearance, and re-emergence of the person, seated opposite one's position, as they, seemingly, "rise" and "fall", against a changing, oscillating background - therefore: "I see you", followed by, "I saw you".

This pattern suggests a New England term that spread down the coast and a separate, Scots-Irish development in Appalachia.

"[7] In the early 2000s, seesaws were removed from many playgrounds in the United States, citing safety concerns.

Seesaw in 1792 painting by Francisco de Goya
A set of conjoined playground seesaws
Fragment of an Attic red-figure krater by the Leningrad Painter dating between c. 470 and c. 460 BCE, currently held in the Museum of Fine Arts , depicting two adolescent girls playing on a see-saw
Seesaws are manufactured in creative shapes, designs and a range of fun bright colours to appear attractive to a child.
A seesaw in a children's playground
Makeshift seesaws are used for acrobatics
Girl hanging from a seesaw, Chicago , Illinois , 1902
Seesaw in Hokkaido , Japan