IKEA's Poäng chair looks as modern today as it did when it debuted in 1976. The U-shaped lounger has clean lines and a simple structure, and often evokes comparisons to Finnish designer Aalto’s famous “armchair 406.” Its design, however, is ultimately a true fusion of East and West, according to Co.Design.

In 2016, the Poäng celebrated its 40th birthday, and IKEA USA commemorated the occasion (and the 30 million-plus Poäng chairs they’ve sold over the years) by releasing two short videos about the armchair’s history and underlying design philosophy. Together, they tell the story of a fateful collaboration between Lars Engman, a young IKEA designer, and his co-worker, Noboru Nakamura.

Nakamura had initially come to IKEA to learn more about Scandinavian furniture. But the Japanese designer ended up imbuing the Poäng—which was initially called Poem—with his own distinct philosophy. He wanted to create a chair that swung “in an elegant way, which triggered me to imagine Poäng,” Nakamura recalled in a video interview. “That’s how I came up with a rocking chair.”

“A chair shouldn’t be a tool that binds and holds the sitter,” Nakamura explained. “It should rather be a tool that provides us with an emotional richness and creates an image where we let go of stress or frustration by swinging. Such movement in itself has meaning and value.”

Save for upholstery swaps, a 1992 name change, and a new-ish all-wooden frame that's easily flat-packed, the modern-day Poäng is still essentially the same product that customers have purchased and enjoyed for decades. Devotees of the chair can hear the full story by watching IKEA’s videos below—ideally, while swinging away at their desks.

[h/t Co. Design]