This article was originally published in NBC News.

A grainy video that recently circulated on social media captured a mundane portrait of school life at the turn of the new millennium.

Students smile and wave toward the camera as they pass through a hallway of blue metal lockers and click away at clunky, outdated desktop computers.

“High school in 2002 looked so chill,” said a caption on a post of the video that has accrued more than 66 million views on Twitter.

It’s the kind of video that has become something of a viral phenomenon in recent years, offering a combination of nostalgia and social commentary on how times have changed. The videos are usually a montage of happy moments or interviews with students about where they hope to be in the future.