A look at subreddit r/Place, which lets users build collective art by posting a colored pixel every five minutes and had 72M tiles placed by Sunday night (Taylor Lorenz/Washington Post)

Taylor Lorenz / Washington Post:
A look at subreddit r/Place, which lets users build collective art by posting a colored pixel every five minutes and had 72M tiles placed by Sunday night  —  Since last Friday, millions of Reddit users have banded together to collectively generate a massive, collaborative piece of artwork that has become a viral phenomenon.