Take a look at some of the illusions that left the online world scratching its head.
The Louvre's Pyramid:
Famed French street artist JR surprised the Parisians last month by making the beloved glass pyramid in the courtyard of the centuries-old Louvre Museum disappear in broad daylight.
So, where did the huge structure suddenly go?
Of course, the modernist landmark, design by Chinese American architect I.M. Pei in 1989, did not actually vanish. The artist just covered its front portion with a canvas photo of a part of the Louvre Palace partially obscured by the pyramid.
The Floating Ship:
Earlier this month, a tourist filmed a mind-boggling scene at Cocoa Beach in Florida, showing a cruise ship floating above the horizon.
The footage, shared on social media app Snapchat, immediately went viral.
However, people soon figured out the ship did not have the ability to fly and that its hovering appearance was due to a striking optical illusion. The image appeared distorted because of Fata Morgana — a natural phenomenon that creates a type of mirage in the distance, seen on both land and sea.
It occurs when light hits a boundary between two layers of the atmosphere that are different temperatures. Different densities force it to bend and travel at different angles, creating the illusion.
The Brick Wall:
This seemingly unordinary image of a brick wall went viral last month, thanks to a Manchester-based Facebook user Arron Bevin.
While many speculated it's a piece of stone or a turtle’s head stuck between the two bricks, some thought it was a simple, plain wall that was just meant to confuse people.
However, it turned out to be a cigar horizontally lodged between the blocks.
Talk about hiding in plain sight.
Duck or Rabbit:
Do you see a rabbit, a duck, or both?
American psychologist Joseph Jastrow first sketched this image in 1899, but it went viral recently after a social media user shared it online.
The deceptive picture was part of research suggesting perception is more than what one sees — it is actually a mental activity.
Apparently, the quicker someone can see the second animal, the more creative they are, according to Jastrow.
As The Independent reports, the images were first published in German magazine “Fliegende Blatter” with the caption: “Which animals are most like each other?”