You have eyes of a marksman if you can spot deadly sniper in picture

To be a top sniper, there are a few things you need, mainly nerves of steel, endless patience and incredible vision.

After many rejected requests for access to their military units, in 2010 and 2013, forces in Germany agreed to give the photographer the opportunity.

And last year, he also travelled to Lithuania and Latvia to capture their marksmen out in the open.

But how quickly can you spot the one hiding in the picture below?

If you look very, very closely at the seemingly empty building, you might be able to see him lurking upstairs.

The marksman has hidden himself in the second-floor doorway, looking straight at the camera.

Speaking to Wired about the project, Simon said while he's been working with snipers for years, it hasn't gotten any easier to find them in his own photos.

"Even though they were staged the snipers wanted to be really properly hidden. For them it was part of their pride."

A few years ago, Simon's first set of images hit the headlines, leaving people scratching their heads trying to find the snipers hiding in plain sight.

So frustrated were some by it all that they actually got in touch with him to complain, and even demanded he prove to them that the snipers were in fact where he said they were.

Simon said: "In a way the interesting part is when the story happens in their minds.

"They look for the sniper and think they found them, but then begin to question themselves. I find that fascinating."

He's now hopeful that some of the other military forces that rejected his advances previously will give him a chance to work with their soldiers in the future.

Adding: "If anyone from the US military reads this, please get in touch with me."