One form of visual trickery that can manipulate our perception is the seek-and-find problem.
In addition to testing our eyesight, they can be entertaining and difficult.
As a kind of seek-and-find puzzle, the "hidden objects" puzzle is quite common.
A picture of a city is what you'll see in this puzzle.
There are a variety of objects in the scene that are concealed in plain sight.
The catch is that you only have seven seconds to locate the two concealed objects, even if it looks simple at first.
The two elusive items are staring you in the face; all you have to do is use your keen powers of observation.