The photo shared shows a picnic table covered with empty bottles and glasses. It has as its background a grey surface of some sorts. The picture asks people what that surface is - a wall or a river. "We cannot be certain. The longer you think, the less clear it is. What do you think?" says the Facebook post.
The picture has collected lots of comments on the social networking site.
"It is a river," says one commenter. "This is a wall because of the size of the leaves on it," says another.
What do you think it is - a wall or a water body? Tell us using the comments section below. Click for more trending news
Get the latest election news, live updates and election schedule for Lok Sabha Elections 2019 on ndtv.com/elections. Like us on Facebook or follow us on Twitter and Instagram for updates from each of the 543 parliamentary seats for the 2019 Indian general elections.