River or wall? This photo has sparked a massive Twitter debate

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Here we go again.

First it was the dress, then it was the flip-flops and now there's another ambiguous photo dividing opinion online.

Twitter users have entered a huge debate over the background of the photo below. 

Some are saying it's a river, while others are adamant it's a wall.

What do you think? 

We can see where the confusion lies.

Either a river or wall would fit nicely into the outdoor picnic scene but the angle makes it difficult to determine. 

And now, just like every optical illusion – everybody's got an opinion. 

Some even got technical about it. 

After a brief office poll, we here at SHEmazing HQ are team wall all the way. 

What do you think? 

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