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Impossible shapes are a kind of optical illusion. Square bars, if viewed from one side, there are 7 bars, but if viewed from the other side, there are 5 bars.
Impossible shapes are a kind of optical illusion. Square bars, if viewed from one side, there are 7 bars, but if viewed from the other side, there are 5 bars.

An optical Grid illusion (also called a visual illusion) is an illusion caused by the visual system and characterized by a visual percept that arguably appears to differ from reality.
An optical Grid illusion (also called a visual illusion) is an illusion caused by the visual system and characterized by a visual percept that arguably appears to differ from reality.

Impossible trident is drawing of impossible object, a kind of optical illusion. It to have three cylindrical prong at one end which then mysteriously transform into two rectangular prong at other end
Impossible trident is drawing of impossible object, a kind of optical illusion. It to have three cylindrical prong at one end which then mysteriously transform into two rectangular prong at other end

Interpretation of Covid-19 antigen test results. The chart explains the reading of the results from the antigen test kit.
Interpretation of Covid-19 antigen test results. The chart explains the reading of the results from the antigen test kit.

The illusion of a staircase that rotates 180 degrees and returns to its original shape.
The illusion of a staircase that rotates 180 degrees and returns to its original shape.

Optical illusion is illusion caused by the visual system and characterized by a visual percept that arguably appears to differ from reality. lines do not seem parallel, but they are actually parallel.
Optical illusion is illusion caused by the visual system and characterized by a visual percept that arguably appears to differ from reality. lines do not seem parallel, but they are actually parallel.

Shepard tables illusion are optical illusion.It's one of the most powerful optical illusions, typically creating length miscalculations of 20–25%.In fact, the two table tops are exactly the same size.
Shepard tables illusion are optical illusion.It's one of the most powerful optical illusions, typically creating length miscalculations of 20–25%.In fact, the two table tops are exactly the same size.

Interpretation of Covid-19 antigen test results. The infographic chart explains the reading of the results from the antigen test kit.
Interpretation of Covid-19 antigen test results. The infographic chart explains the reading of the results from the antigen test kit.

Interpretation of Covid-19 antigen test results. The infographic chart explains the reading of the results from the antigen test kit.
Interpretation of Covid-19 antigen test results. The infographic chart explains the reading of the results from the antigen test kit.

How to use the COVID-19 antigen test kit. An infographic showing procedure for using the rapid antigen test kit.
How to use the COVID-19 antigen test kit. An infographic showing procedure for using the rapid antigen test kit.

The illusion of an impossible staircase When viewed from above, it can be seen as a downward direction. But looking at the bottom, it will be the way up.
The illusion of an impossible staircase When viewed from above, it can be seen as a downward direction. But looking at the bottom, it will be the way up.

grayscale image of tiled square blocks, cubes stacking vector
grayscale image of tiled square blocks, cubes stacking vector